When comparing Razer Deathadder 2013 vs Logitech G303, the Slant community recommends Razer Deathadder 2013 for most people. In the question“What is the best gaming mouse?” Razer Deathadder 2013 is ranked 10th while Logitech G303 is ranked 14th. The most important reason people chose Razer Deathadder 2013 is:
While being mainly designed for palm grips using a claw grip will still work, though with a weird placing for the palm.
Specs
Ranked in these QuestionsQuestion Ranking
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 Excellent sensor
The G303, along with the Logitech G502 and G900 and the Corsair M65 PRO RGB, has the single best sensor on the market, the Pixart PMW3366. This sensor has no acceleration or angle snapping that can't be disabled and has a native DPI of 12,000.

Pro Compact size gaming mouse
People with small hands needn't look at mice like the Corsair M65 gaming mouse and despair. The G303 gaming mouse has a solution. It's about the size of the $5 USB mice that are often bundled with desktop computers, but it has most of the features of a full-size gaming mouse.
Pro Comfortable
Logitech G303 is very comfortable if you have medium to small hands, and if you are using your mouse with claw or fingertip grip.

Pro Accessible price
The G303 gaming mouse has an MSRP of $49.99, but it goes on sale rather frequently for as low as $24.99. Compared to high-end gaming mice like the Rival 700 and the G502, that's quite a steal.

Pro RGB lighting
It glows. You can change the colors. There isn't much more to say, except that it will fit in with basically any setup that uses black devices with colored lights.
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 Build quality not the best
Scrolling wheel sometimes makes cranking noises while you are scrolling through it. If you tighten the mouse from the sides, the cheap plastic will make a noise.
Con A minimum selection of buttons
The Logitech G303 only has one controllable button on the top, two buttons on the side and a programmable mousewheel. The mouse offers six different buttons if you include left- and right-click.
