What are the right cranks?

Hi, I’m looking at buying a unicycle, but there are a few things I don’t know. Anyways, I want one that will be good for tricks in all terrain, but mostly street stuff. Would that be trials or street uni? Also I don’t know the difference between cranks. What would work better; ISIS, cottered, coterless, or splined? That’s all I can think of now. I will probably post more questions later. Any advice helps!

trials (KH or any Impact)
ISIS only

greets