Very good question!
I live here in Michigan, and there are plenty of trails that will accommodate both 48" and larger. If you like to stay on the trails vs the routes, The Ace will have more than enough power because anything over 25 mph is probably too fast, on the other hand if you hit the forest roads, routes, and other wide open trails, speed is your friend.. And again the Ace 50mph plus will do it for me, but the scrambler would be a blast too.
I own a polaris 550 atv, and now an ACE too. I have the best of both riding experiences, because I can switch on and off between the two. And if you are talking about the $13,000 Scrambler, you could probably get an ACE and and a 570 sportsman for about the same money. The speed factor are worlds apart from each other, but for the money and the fun, I would get the ACE!
Also, look at Baldwin area, or St Helen for some nice open trail systems. Some of the snowmobile trails are multi use. I'm looking forward to getting the weather to test imply new ACE out on some of these.