In that case either would be fine. I wouldn't sweat the training location; its short enough in your overall career that it shouldn't override a more rational decision.

The question about who owns the regional is a valid one, but like the poster said there's not enough data out there to justify a decision based on that. The reality is that you'll apply to everyone you want to work for and then take the first class date.

Your next step is to find out the reserve rules for each carrier and figure out if you could sit reserve at home, i.e. a 2 hour vs 3 hour callout. If the latter you could sit at home until called then drive in. If the former you place yourself in a little more risk with regard to making your showtime.