When comparing Logitech G303 vs Cougar 450M, the Slant community recommends Logitech G303 for most people. In the question“What is the best gaming mouse?” Logitech G303 is ranked 14th while Cougar 450M is ranked 47th. 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 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.
Pro Resistant braided cable
The cable is braided so it doesn’t bend easily.
Pro DPI button binding can be configured
The DPI button, which is located on top of the mouse, is actually a profile changing button and can be tied to button configuration or lighting options.
Pro Long list of customization options, for a budget mouse
This mouse has some basic sensor-related customization.You can modify the polling rate, DPI amount, lift-off distance and even angle snapping. The angle snapping is an on/off choice instead of a slider. Its UIX companion software has an extensive list of customization options, notably long for a budget mouse. It includes lighting options, button rebinding, macros, DPI changing, multiple profiles and several other smaller features that even other non-budget mice don’t have.
Pro Good performance for fluid gaming
The Cougar 450M uses the Avago 3310 sensor and presents no jitter, acceleration or smoothing. The DPI choices ranges from 50 all the way up to 5000 with increments of 50. For this sensor, every DPI step of 50 should work equally well, so you don’t have to worry about keeping track of native DPI settings.
Pro Easy to manipulate
Being an ambidextrous mouse, it avoids unconventional shapes and stay true to the classic mouse design. To facilitate control and finger grip, it has a slight incline located at the side and its sides are covered in textured plastic.
Pro Good for left hands and right hands
The mouse has an ambidextrous design, making it a possible choice for left-handed users. It also has extra buttons on both sides, so they can be used on both use cases.
Pro Sensor is able to reliably track precise movements
It’s Avago optical sensor is a solid performer recognized many mouse enthusiasts. You can rely on it to track precise movement without worrying about acceleration or jitter.
Pro Great value
Despite the low price point, this mouse still maintains a respectable list of features. It has a good shape, reliable sensor and plenty of customization options. It bridges the gap between low cost and high quality while still being well built.
Cons
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.
Con Minor sensor rattle can be slightly annoying
There is some minor sensor rattle which is common with cheaper mice but otherwise has no effect in performance.
Con Companion software is only available for Windows
The UIX companion software is only available for Windows.
Con Feels somewhat cheap and gets dirty easily
The body of the mouse is covered with smooth, glossy plastic that feels cheap and can easily get greasy from sweat after prolonged use. Some people might find it uncomfortable to use and a hassle to clean often.
