Wondering whats the best dps to main.

if it comes to me mccree/widow + a little bit of pharah once i started to main those i climbed from 2.7k to 3.5k within a week

no.. i'm not kidding
i have played a lot of TF2 2k+ hours as scout/sniper + a little bit of soldier in ETF2L league
and then CS:GO where I achieved Global Elite


it depends if you have background in other shooters

if don't, then i would suggest pharah, she is easy to pick up and owns everyone in low rating games

if you want to play hitscans, then i would suggest you to practice on bots / aim hero, there are plenty of tutorials how to do it properly