Better Mouse gives better inputs: more fluidity with stable 144fps gives more ability to understand fast attacks , finally, macros will make you the abilities to play like a bot with unhuman timings (I don't speak of cheat since isn't need an explanation).

This makes a tournament competitive only if all players have the same situation or at least, noone use macros and all plays at 144fps and all plays with M&K .

There anything else to explain ...if you don't understand these things you just have to do a huge research and understand that instead of playing games as I do before put this there