Ive owned both and ran them both on carpet with foams. I really like both of them actually. I got to where they would both turn about the same laps at the same speeds for my driving style. Only reason I chose the Losi, is that it is sooooo much easier to drive fast. Once you find that basic setup (easy now to the poplularity of the car) its dialed. Although most will tell you teh batterys are a pain, but who solders batteries fast anyway. Either way you will take your time. And if you put the corally (tube) connectors on your car it makes everything soooo much easier. Dont let something silly like that keep you from getting a great car.
There are a lot of other good options out there too. The only reason I would shy you away from any other is simply for parts availability. I honestly probably would have tried another car had I been able to get parts a little more easily. You need to find out what the fast guys are running at your home track (its good to get setup help from the fast locals) and find out what cars your shop supports the most and go that route. Its the easiest and quickest way to become competitive. I hope this helps.
Either way, have fun and race man.