I believe the DTM and the 2.0T s-line special edition are both at 220BHP, so no need to remap. It's about looks, I like them both, just missed out on a DTM unfortunately so got the other one instead.
The DTM looks more aggresive, originally it carried an extra £5k price tag, but second hand that difference is probably limited. If you've got the option and there's not much difference go for the DTM (dependant on optional extras spec of both and what's important to you)