.
Re wheel shape, same as others have said, but it was an interesting experience the other day.
At this one park, the bowl more often than not has quite slippery (waxy) coping, and I just didn't feel like grinds were balanced, more often than not ending up in the back seat and letting them go / jumping off, especially compared to some other places that are not waxy and actually grind, not truck slide.
Anyway, that was all on my usual Classic shape which are great everywhere else and grind for days on normal coping. Then I tried another almost identical setup I had in the car, but that board had Conical Full wheels on it that I had not changed / altered at all, so what do you know, I actually stayed on and it was like I had brake pads on my wheels, when compared to the Classics on the same coping.
So yes, it can definitely make a difference in how things work, if you are used to it, or not so used to it.