Zealot

Hi, I am trying to decide what beginner DCC system I want to invest in. I know nothing about the world of DCC but I have it narrowed down to either the Digitrax Zephyr or the NCE Power Cab system. My HO layout is going to be 2 ft wide and built around the perimeter of my 12 x 12 room. I want to have a system that can handle 3 trains at a time and be able to run at least 2 cabs for my son and I. Can you give me some insight as to what would work best for me? I don't quite understand the comparison specs of each system. I do plan to expand my layout beyond my 12 x 12 room in the future, but not now. Any information will be helpful. Thanks, Mark