Is that a marizocchi on the STP? I can't comment on the Kromo as I never owned or ridden one... but I did enjoy the STP while I had it. However, both bikes will be great starter bikes before you figure out what feels good to you. For me I went from a P.1 to STP to Blk Mrkt MOB.
When we were staying in Winter Park for Crankworx Colorado, we rode Trestle on our hard tails for a few runs as a warm up before hitting the slopestyle. It can be done, especially some trails on trestle... but be prepared for a pretty bumpy, arm pumpy ride. I'm with turman though - rent a full squishy bike and you'll...