A: Bob, while we hesitate to recommend one brand over another when their benefits are comparable, it is clear that you need more power for your fairly large layout. Any of the three options you list will probably work well.
Or, you might consider buying two additional transformers and assigning independent power sources to each of your loops.
Regarding command control, both the Lionel and the MTH systems work well, particularly when used with their own locomotives, or, in the case of TrainMaster Command Control, Atlas O and Weaver locomotives that come with TMCC. I’d recommend doing some research before making a decision.
Neil Besougloff’s book, Command Control for Toy Trains (available at hobby shops or from Kalmbach Books, 800-533-6644), is an excellent place to start.
The whole command-control matter boils down to a personal choice. You don’t have to go there yet. Get your power shortage fixed first.