When i skied the T-Halls i didnt really notice the rounded edges on groomers. But if your sliding rails your edges are gonna get rounded anyway. It depends if you want a ski that will be really easy to butter on. I found the butter zones on the fujatives better than the t-hall butter zones as they could hold a butter better, the t-halls are softer than the fujas tooIt also depends on what sort of ski you like. I personally love soft skis. I've never ridden a STL so cant comment on that. I would recommend the AR5's. They are such a sick ski. Great in park and all mtn (especially pipe). But those skis are all super sick so it just depends on your ability,preference and whats important to you in a ski.
----------------------------------------
SnowPark NZ-
www.snowparknz.com