Mamba or Death Adder ergonomics?

This is something that is 100% personal preference based on how you hold your mouse. I'd recommend finding a local store that offers both mice and test them out for yourself to see what you prefer. :)

I own both They honestly feel identical, as far as ergo is concerned

Like i write in most of this kind of topics go to local store and cheack them there for more info about the mouse spec you find in razer store and get the best one that match your usage :)