Hey old friend, I know we haven't talked in a very long time, but I started up on Deviantart again. It's been a long few years and I'm glad i remembered your old account so I could find you here. I hope you're doing well, you're still as skilled and wonderful as ever! Keep it up, I'm always gonna be your huge fan!
Best, Sylenvie/Azuma/Ophilia/and others ;)
I just use a hard round, soft round and a square. I use Photoshop and have never used SAI. I'd say it's less about the brushes, more about how you use them. Like if you think about traditional painters, they all use brushes without any digital effects but can all paint different things.