When comparing Logitech G602 vs Zowie EC1-A, the Slant community recommends Logitech G602 for most people. In the question“What is the best gaming mouse?” Logitech G602 is ranked 15th while Zowie EC1-A is ranked 20th. The most important reason people chose Logitech G602 is:
Great for palm grip along with a the fantastic logitech software for key mapping and profiles.
Specs
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Pros

Pro Comfortable for palm grip with easy to hit buttons
Great for palm grip along with a the fantastic logitech software for key mapping and profiles.

Pro Great battery life
Good for users that want a wireless mouse without any loss of functionality or need to change the batteries every week

Pro Good optical sensor
Only up to 2500 DPI but it's a great sensor for those that don't need very high DPI.
Pro Can run on single battery for lighter weight
Users can opt to run the device on a single battery to cut down on the weight but this will have an impact on battery life.
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).
Cons


Con Somewhat heavy
Being that this is a wireless mouse there is the battery weight to contend with. Batteries in the weight of the device is 152 grams, which isn't all that bad considering but still not for users that like a lighter mouse.
The mouse can also be used with a single battery, which is useful for not only reducing weight but also for balancing the mouse. With two batteries the mouse can be a bit slipper on the right side when picking it up as the pinkie and ring fingers don't have as much to grip - but balancing the weight over towards the thumb allows the mice to be more easily picked up as the side buttons allow for a decent place to grip.
Con No wired option
The Logitech G602 does not offer a wired USB option, only wireless.

Con Macro Key Defect
Side buttons are known to register multiple keystrokes occasionally when pressed only once. With bindings such as Ctrl+F4, this naturally has destructive results.

Con Middle mouse button wore out after a year of heavy use
And with no way to open it it's near impossible to fix.
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.
