I butterfly click and jitter click, My aim is a lot better when I butterfly click so I use that more, I click 10-13 cps when I butterfly click and 12-14 cps when I Jitter click. Jittering/butterfly clicking does improve your pvp skills and gives you a better advantage towards players to click slower then you, you get better combos and will hit them faster.
Autoclicking isn't that much of an advantage, cps doesnt really do much tbh, theres ticks in minecraft so it's not like if you are clicking 20 cps you are going to hit the player 20 times per second, so many people autoclick nowadays anyways. I know it is against the rules but the staff on here wont even find out anyways, I've autoclicked on this server for over 2 years without being banned, I've been screenshared a few times but they never found it in a ss