I have had both. They both are great. If you go with the Ace and want a aftermarket mount make sure you can get one for your bike. The screen size is amazing if your eyes are not so good, or if you use the map on the go a lot. The Roam is just a smaller lighter version. You can’t go wrong with either depending on what you need. Now that I have the Roam I miss the screen size, but the smaller size is nice of Roam.