I am looking at these two OTAs too. As far as I know VC200L has a great comma free flat field while VCM200L doesn't. So I think VC200L would be much better choice for astrophotography.
Here is a page where they are compared
http://www.astronomie.be/Tranquility...vc200lpage.htm
The bad thing about these OTAs is that they have a big fat spider and stars dont look better because of this. Besides from this VC200L is reported to be a great imaging scope.
Check this
image of M31 that was taken with VC200L and QHY8.
Also I could not find VC200L locally. Instead there is VC200L DG model available. Unfortunately there is nothing available to tell you what the difference between standard VC200L and the one with DG letters.
cheers,
Mike