When comparing Razer Deathadder 2013 vs Zowie EC2-A, the Slant community recommends Zowie EC2-A for most people. In the question“What is the best gaming mouse?” Zowie EC2-A is ranked 3rd while Razer Deathadder 2013 is ranked 10th. The most important reason people chose Zowie EC2-A is:
The Zowie EC2-A is made of high quality plastic that's lightly coated to help with grip. The buttons click easily and the rubber cable is thin and flexible. All of this combined gives a feeling of quality, while also being functional as a high-end mouse.
Specs
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Pros
Pro Comfortable gaming mouse for palm and claw grips
While being mainly designed for palm grips using a claw grip will still work, though with a weird placing for the palm.
Pro Left- and right-click buttons have a concave that helps fingers stay in place
The users fingers rest easily inside of the concave left and right buttons. By being concaved the users fingers also stay in place.

Pro Affordable
At $50 it's not an expensive gaming mouse for what it offers.
Pro Slightly larger than a common mouse
With dimensions, 127 mm/5.00” x 70 mm/2.76” x 44 mm/1.73”, Deathadder is just a bit bigger than an everyday gaming mouse.
Pro Accurate 6400 CPI optical sensor
The mouse has a 6400 CPI optical sensor with X & Y variable axis. No angle snapping, no acceleration, no prediction.
Pro Two side buttons in an easily accessible yet unobtrusive position
The two left side buttons are position so that they stay unobtrusive yet easily accessible.
Pro Braided cord
Helps prevent kinking, curling and protects the cable prolonging life of the gaming mouse.
Pro True rubber grip helps to get a better hold of the mouse
The mouse has a true rubber grip as opposed to common rubberized or plain plastic grips.

Pro Reliable, notched scroll wheel
High quality scroll wheel.
Pro Reasonably lightweight at 105 grams
The Razer Deathadder 2013 sits at a reasonable weight of 105 grams, which is 8 grams lighter than the previous 3.5 version.
Pro Synapse is well-designed driver software
Synapse can be a useful tool by saving a users setting to the cloud automatically, setting do not need to be remembered upon re-installs or using a friends PC.
Pro Rubber grips are smooth
Pro Left hand edition available
Razer offers a right and left hand edition for the Deathadder model.
Pro Well built
The Zowie EC2-A is made of high quality plastic that's lightly coated to help with grip. The buttons click easily and the rubber cable is thin and flexible. All of this combined gives a feeling of quality, while also being functional as a high-end mouse.
Pro Excellent accuracy
The Zowie EC2-A delivers accurate mouse cursor movement that is essential to any gaming mouse. The Avago 3310 sensor used by this mouse is exceptional. It delivers a true portrayal of mouse movement with no jitter, acceleration or prediction. The available DPI choices of 400/800/1600/3200 are all native and should ensure an equally good performance, regardless of which one is chosen.
Pro Gets all the little nuances that make a mouse comfortable to use just right
The left and right mouse buttons have small grooves to help fingers rest in place. The left side lets the thumb grip the mouse comfortably. The side buttons are in an easily accessible, yet unobtrusive position. The coating is slightly textured to help you control the mouse confidently.
EC2-A weighs just 94 grams, making it light enough for quick mouse movements and won't cause fatigue after extended use. At the same time, the mouse feels solidly built.
Its elegant, ergonomic design is suitable for most hand sizes regardless of the way you hold it.
It's worth noting that Zowie offers the EC1-A version for larger hands.
Pro Button switches click easily
Although the buttons have Huano switches, which are more stiff, the shell of the mouse somehow negates this and makes them click easily, just like typical Omron switches.
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Pro No extra cruft
There's no advanced functionality or accompanying software. There are just 5 buttons and the only settings you can adjust are CPI, polling rate and lift-off distance. And only in preset intervals via specific mouse button combinations. It's a mouse that focuses on the essential factors only - comfort, performance and build quality - all of which it excels at. It doesn't get distracted with anything else. If you think all the bells and whistles that come with gaming mice are unnecessary, this just might be what you're looking for.
Cons
Con Requires signing in and connecting to a server before the mouse can be used to its full potential
To get the latest drivers or edit settings you have to download "synapse" an "online cloud device updater and profile storage" application. You have to register an account with your email and have it running in the background constantly for changes to take effect.
Con Poor build quality
Con Scroll Wheel may stop working
You can look it up on youtube, there's a video which explains how you can fix it but you'll need to physically open up the mouse and void the warranty.
Con Driver for side buttons in not open source
The mouse has two button for thumb control. The driver for the mouse and is not open source and not available for Linux users.
Con Distracting lights, wich can be turned of this can be done trough the Synapse software
Although the lights on the mouse look nice, they may bother or be distracting to some people. If they are too distracting, they can be turned off but that does require proprietary software that many do not like having installed.

Con Software issues
Using Razer Synapse causes slower boot up times as well as forced online sign in to use which is just a cheap attempt at an always online DRM.
Con Middle click dies way too fast
Several users of this mouse have complained that the middle click doesn't last long, in some cases not even 1 year.
Con Rubber coating
Like all of razer's mice, this one has a rubber coating. Which means that it's hard to clean, will drip oil after long period of disuse and generally less comfortable than hard plastic.
Con Limited customizability
None of the buttons can be rebound, there are no macros, profiles, or customizable weights. And while the Zowie EC2-A allows you to customize the most important performance settings - CPI, lift-off distance, and USB polling rate - their customization is limited to preset intervals.
Con DPI switch can't be accessed during use
The DPI switch is a button that can’t be accessed while in use because it's located under the mouse.
Con Extra travel on side buttons
Side buttons have a bit of pre-travel. You have to press in about 1mm more than usual for the mouse to register the side button clicks. Some may find this annoying, but it helps avoid accidentally clicking side buttons in-game.
Con DPI colors annoying and can't be customized
The scroll wheel has an LED that changes color depending on your DPI setting, but the corresponding color cannot be customized.
Con You have to learn button combinations to change settings
The Zowie EC2-A has no accompanying software. Settings have to be changed through various button combinations. As a result the initial setup can be a bit of a hassle.
