I believe my class was offered the chance to request a training location without the guarantee of it being granted.
I only went through DFW. Personal thoughts are, do the one that is less stressful for coming and going… or even creates less headache while there. I don’t live in DFW but I could drive there which meant I had a car there while at training and then was able to simply drive home when I had a couple days off. I would have done the same for CLT if I lived closer to there.
That said, I avoided the mother ship hotel. There are other hotels in DFW they use. If you don’t like the hotel arrangements assigned, you can call and have them change it.