Both locations are a Flighty Safety and staffed by Envoy instructors. The sim in DFW* used to be in STL but about a year ago they moved it down to DFW. Some people claim that one sim is "better" than the other but neither feel quite like the airplane so unless you have to switch sims mid training it's not really an issue IMHO.

As far as the hotels, the DFW holiday inn is a dump and has been for years. The only thing they give you for free a coupon worth a few $ if you don't get your room cleaned that day. The STL Drury** is not only a slightly nicer hotel they give you free breakfast and dinner.

My personal preference would be STL for long term, or DFW for recurrent just to avoid the extra travel days. Unless you live in or close to either city in which case just drive.

*There are 2 Flight Safety locations near DFW. One is on diplomacy road south of the airport has the 175 sim. The other is on airfield drive between runways 35R/C and has the CRJ sim.

**I haven't been to STL in over a year. There's a chance we changed hotels.