I do prefer the ERJ to the CRJ primarily due to the single seat. I think many of the RJ's both COX and UAX look tired and worn out. Maybe it's just me but I generally think many of the aircraft I board are way too hot, especially the RJ's.
The service/FA on both have been pretty good. IAH-DAL is a short hop, there seriously does not need to be a drink service. All of the FA's I've had on short hops tell you to ring the bell if you want something.