When comparing Zowie EC1-A 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 Zowie EC1-A is ranked 20th. 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 Sensor and DPI options ensure fluid and optimal gaming performance
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 Ergonomic, accommodating shape, especially for those with big hands
Though it may look tame, the mouse’s shape is quite ergonomic. Its subtle curves help your fingers position themselves while also allowing various grip types. For the same reason, the bulge of the mouse is located strictly in the middle, making it accommodating for the most amount of people, and even more for gamers that have big hands. Nevertheless, it may be more suited for palm grips because of the subtle curve at the right side which provides support for the ring and pinky fingers.
Pro Flawless movement, essential for gaming
The EC1-A delivers accurate mouse cursor movement that is essential to any gaming mouse. Virtually flawless, it has none of the precision-altering flaws that are apparent in other mice.
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.
Pro Smooth mousepad movement
The mouse comes with two mouse feet that are larger than normal and ensure smooth movement over the mousepad.
Pro Includes a set of thumb buttons
The EC1-A includes a set of thumb buttons which are standard for most mice.
Pro Built to last
The switches don’t randomly break down, no component excessively rattles and the scroll wheel doesn’t degrade easily. Although the mouse has a rubber cable which is quite vulnerable to bending and damage, the mouse as a whole is well built and can be expected to last.
Pro Coating ensures a good grip
The mouse has a smooth plastic coating that doesn’t feel slippery. You can easily hold the mouse with a comfortable grip even without the rubber sides.
Pro Some customization options
The EC1-A has only a few customization options, all of which are sensor related. It is possible to change the lift off distance, polling rate and the DPI settings (400/800/1600/3200).

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 Customization options are limited due to the lack of companion software
There is no companion software to this mouse, which means you cannot do thorough customizations, such as button remapping or custom lighting.
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 Side buttons don't register easily
The side buttons require you to press deeply before it registers an action.
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 The customization process is inconvenient
All Zowie mice are built to be straightforward and simple to use. However, its settings cannot be changed easily during normal use: you have to unplug the mouse and use a combination of different button presses while plugging the mouse in, which is unintuitive and a hassle to learn.
Con Not manufactured anymore
The Zowie EC-1 is no longer manufactured by Zowie but it still can be found on eBay and Amazon from third party sellers.
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.
