I only have Photoshop on my computer right now, but I will soon have Painttool SAI as well. I used to have SAI on an older computer about 8 or 9 years ago. I'm excited to use SAI again because I was watching an artist stream last night and their lines were so fucking smooth. They did one pass and it seemed to auto-smooth. When I try to do that in Photoshop, I still get tiny wiggles from my hand shaking. I don't know what setting to put it on to make that happen. It's frustrating as hell. The possibility that I will be able to soon draw smoothly with little effort is very enticing. If any of you know what settings you have to have the pen tool on for super smooth lines in SAI, please let me know. I don't remember the program much at all. It's been so long since I've used it. But if I'm able to draw faster and more accurate with SAI, I may actually open up commissions. I'll let you guys know. :)