That is curious. I suspect that you had the Raster Charts product installed in one of those programs but not the other.
I have never seen any of these with "scanned" charts, other than the RC stuff, which you buy as extra.
MM has nicer maps for the UK, sure, but zero international coverage. Also it doesn't really support aviation as such. You can't do any sort of real route planning on it. IMHO it is good for one thing only, which is printing off bits of the CAA charts, saving you having to fly with the whole unwiedly thing.