A medium/small ambidextrous mouse in the G305 and a large ergonomic mouse in the EC1, if you're looking at comparing these mice, please first get a good measurement of your hand size so you can figure out which one is better for you.
There are a couple of distinct advantages that the G305 has over the EC1, better buttons, wireless connectivity and a lighter weight.
Both mice will track perfectly with their flawless sensors.
Side-by-Side Comparison
| Mouse name | Logitech G305 | Zowie EC1 |
|---|---|---|
| Picture |  read reviewCheck Price on Amazon |  read reviewCheck Price on Amazon |
| Length | 11.6cm | 12.8cm |
| Width | 6.2cm | 6.4cm |
| Height | 3.8cm | 4.3cm |
| Weight | 88g | 97g |
| Buttons | 2 Primary Buttons 1 Middle Scroll Button 1 DPI Button 2 Side buttons | 2 Primary Buttons 1 Middle Scroll Button 1 DPI Button 2 Side buttons |
| Sensor | Hero 12K Sensor | Pixart PMW3360 |
| Shape | Ambidextrous | Ergonomic |
| Cable/Wireless | Wireless | Soft rubber cable |
| Battery Life | 250 hours non rechargeable on AA battery | N/A |
| Software | Logitech Gaming Software: Surface tuning RGB lighting settings DPI stepping Saved profiles on the mouse Button remapping Input analysis Macro recording | No software: DPI settings are preprogrammed Step 1: 400 DPI Step 2: 800 DPI Step 3: 1600 DPI Step 4: 3200 DPI |
| Warranty | 2 year warranty | Unknown length |
| Pros | Best buttons of all gaming mice Marathon battery life Light | Comfortable super popular shape Flexible rubber cord Flawless sensor |
| Cons | Might not be the best shape for all, good for small to medium | Loud scroll wheel Issues with accidental clicks |