I think it depends on what you're looking for, Acme has topo, terrain, aerial, road, etc, whereas MSN doesn't have the topo or terrain, which is more what I'm specifically looking for. Also zoomed in on my house, I get a better view from Acme that I do MSN, I also get a better zoom on the area I'm intending on elk hunting than I do with MSN. The TOPO and Terrain maps are what I kind the most useful for me personally though, and it's has pretty good detail vs. most mapping programs I've used.