If you haven't tried the combat manager, I can't recommend it highly enough!
Although I think the map feature of MapTool is way better than the one for Masterplan, I like the fact that Masterplan also lets me easily track damage, expended powers, and initiative. When looking at MapTool, I wasn't immediately convinced that it could do all of these other things.
Berc
I'm just coming up to speed with Masterplan, and it seems to me that it's better for home-brew campaigns than published ones like WotBS, which aleady has everything so well laid out. We also prefer to use figures and printed maps for our encounters.
I might stick with DnD4e Combat Manager which is being developed again![]()