If you used a "pure android" phone you would probably hate it. There is no phone on the market that is "pure android."
Back on Topic, get a Tri band device, you'll be glad you did in a year or so. As for which one, it's about weighing pros and cons and determining what's important to you. I'm going to get the S4 Tri band edition because it's best for me, but you might have different priorities.