Go with what your used to and comfortable with, id say its the same debate as with oils or radio gear, I've heard all kinds of bad things about both, ive heard alot of good things about both, I've seen fabulous covering work done with both. Go with the colors you like is my vote.
Myself, using monokote, because its what I learned with, and the majority of professional builders/ coverers , quote using it.
Oops, forgot to answer part 2 of your question. Tower Hobby, stupid fast delivery times, usually days before quoted arrival , bulk discounts, and prefered/valued customer account ,$25.00 for 3 years, I think, and adds 25-50% savings on shipping. Cant remember the details but its worth it.
Like to see some scetches/ 3 views of what your going to do, post em when you can. Thats my favorite part.. choosing the scheme!