When comparing Steelseries Rival vs Logitech G303, the Slant community recommends Steelseries Rival for most people. In the question“What is the best gaming mouse?” Steelseries Rival is ranked 9th while Logitech G303 is ranked 14th. The most important reason people chose Steelseries Rival is:
The Steelseries Rival gaming mouse has a built in Pixart PAW3310 optical sensor that offers great tracking control.
Specs
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Pros
Pro Great tracking
The Steelseries Rival gaming mouse has a built in Pixart PAW3310 optical sensor that offers great tracking control.
Pro Works great on Linux, using the libratbagd software
Pro Satisfying clicks
Steelseries boast of new in house built switches used inside of the Rival. Use reports have claimed that the clicks as "satisfying".
Pro Great accompanying software suite
Steelseries uses a software suite called Engine 3 that is low resource and used to customize their gaming mouse options.
Pro Great value for money
At $59 the Rival gaming mouse has a great balance between build quality and value for money.
Pro Great grip and comfortable
Pro Customizable colors for scroll wheel and palm lights
The Steelseries Rival gaming mouse offers 16.8 million colors with two zone illumination.
Pro Absolutely the best for a gaming mouse claw grip
When You have relatively large hands.
Pro DPI can be doubled with software
The 5000 DPI of the Steelseries Rival can be doubled to 10000 with Steelseries firmware.

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 Rubber grips get worn out very quickly
Con Rubber grips get slippery with sweaty hands
When using the mouse for long duration's the sweat from the users hands can make the rubber side grips slippery.
Con Cannot turn of lighting without Steelseries proprietary software
The lighting on the device can not be adjusted without the Steelseries software.
Con Labled DPI is incorrect
Steelseries labels the DPI as 6500 for the Rival when in fact it is 5000.
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.
