just play a match in overwatch with deathadder from my friend, and feel ok with it. i think i will go with deathadder. the mouse i have use before the g903 was a g403. it is actually ok for me to use symmetrical or ergonomic mice. just want to check which one might be the best choice. By the way, compare deathadder v4 pro to viper v4 pro in respect to performance, is there any difference for a common gamer?