here is what you gotta keep in mind.
DRIVING TIME.
there are 3 main busy times at most gyms.
early morning from 6-9 am
mid afternoon 11-1
evening 4-8
that leaves a couple hours of downtime. chances are you may not fill all those hours so you may have a "dead" hour in there as well where you are doing paperwork, sitting around, eating, or working out.
i have the luxury of being about 10 min away from the gym so i will take odd appt times, but if you work 20-30 min away or more, you will either have to really stick to your guns with your clients about having them schedule back to back with each other or do alot of driving.
i would stay close to home in this case, it sounds like both areas are rather well off so clients wont be too much of a problem. are either clubs, sport clubs? that would be the way to go. larger member base, more amenities, larger draw of those looking for a "better" club. hence....more open to training.
just my thoughts.