first thing that came to mind when I upgraded from my 75 gallon was budget. The bigger the tank the more $$$ to fill it. Not only $$$ for fish and corals but equipment to. Bigger skimmers, more lights, bigger sump/pumps. water changes. you get the point.
What fish do you want to keep in the tank? triggers/blue tangs, those will be happier in the 6' tank. the space its going in? Does the 6' over power the room? or does it look right? I personally went for the 120 gallon because of my space, and I really loved the depth (2') over length.
What ever you choose I'm sure you will be Very Very happy with it. Good luck
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