I hear alot of happy evader ppl. I run rc10gt, so I don't know either platform, but I would say stick with what you know, unless you don't like it. If you already have some evader experience, and it isn't negative, then run with it. Nitro is frustrating enough sometimes when you are familiar with the vehicle, so for a nitro noob(no offense). I would recommend going with the platform that you already know.
As far as tires...It really doesn't matter what it comes with. If you are gonna drop that kind of change on a vehicle, then an extra $20 or so for another set of tires, rims, and CA is chump change.
While you are at it, pick up a small variety of shock oil(20wt-50wt) for experimenting, some after run oil, air filter oil, and a temp gun.
Good luck, and have fun.