There is a pretty big difference between the naga and the hex. The naga has 12 side buttons versus the 6 on the hex. However the buttons on the hex have a bit more travel and a harder click, better suited for constant use. However I'd have to say i'd prefer the naga.
The stealth edition uses a linear key which makes it virtual silent. But it gives up the tactile click that the green key does. Not really a big deal for most first person shooters as the keys are usually held down. But for RTS games and mybe even Moba games it's nice to feel when the buttons were pressed.