When comparing Logitech G602 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 4th while Logitech G602 is ranked 15th. 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 for palm grip with easy to hit buttons
Great for palm grip along with a the fantastic logitech software for key mapping and profiles.

Pro Great battery life
Good for users that want a wireless mouse without any loss of functionality or need to change the batteries every week

Pro Good optical sensor
Only up to 2500 DPI but it's a great sensor for those that don't need very high DPI.
Pro Can run on single battery for lighter weight
Users can opt to run the device on a single battery to cut down on the weight but this will have an impact on battery life.
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 Somewhat heavy
Being that this is a wireless mouse there is the battery weight to contend with. Batteries in the weight of the device is 152 grams, which isn't all that bad considering but still not for users that like a lighter mouse.
The mouse can also be used with a single battery, which is useful for not only reducing weight but also for balancing the mouse. With two batteries the mouse can be a bit slipper on the right side when picking it up as the pinkie and ring fingers don't have as much to grip - but balancing the weight over towards the thumb allows the mice to be more easily picked up as the side buttons allow for a decent place to grip.
Con No wired option
The Logitech G602 does not offer a wired USB option, only wireless.

Con Macro Key Defect
Side buttons are known to register multiple keystrokes occasionally when pressed only once. With bindings such as Ctrl+F4, this naturally has destructive results.

Con Middle mouse button wore out after a year of heavy use
And with no way to open it it's near impossible to fix.
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.
