As obvious as it sounds, I strongly recommend shopping at a specialty bike store. They are the experts, and they will be able to help you decide which bike is best for you.
“I was six when we came to this country. When I was 14 or so, I still had a lot of trouble with it.”
“Mankind are apt to be strongly prejudiced in favor of whatever is countenanced by antiquity, enforced by authority, and recommended by custom.”