When comparing Roccat Savu vs Logitech G303, the Slant community recommends Logitech G303 for most people. In the question“What is the best gaming mouse?” Logitech G303 is ranked 14th while Roccat Savu is ranked 42nd. The most important reason people chose Logitech G303 is:
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.
Specs
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Pros
Pro A lightweight braided cable
Roccat Savu has a lighter than usual braided cable that helps prevent kinking, curling and protects the cable prolonging life of mouse.
Pro Accurate 4000 CPI optical sensor
The mouse has an accurate 4000 CPI optical sensor. No angle snapping, no acceleration, no prediction.
Pro Great grip provides good control over the mouse
A high quality rubberized grip on top and a sweat-proof grip material on the sides provides good control over the mouse.
Pro Full Linux support
Roccat has good Linux drivers.
Pro Roccat Talk informs which profile is selected when switched
Pro Easy+Shift allows for double mouse actions
Pro Good driver software
Pro Accomodating thumb rest
Pro Good build quality
The mouse weights 90g.
Pro Good for smaller hands

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 Reports of non-slip grip wearing off within a year
The soft touch coating does not last and will wear easily.
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.
