In the interests of full disclosure, I have previously owned Watt Puppy 3/2's, Genesis V's, and Genesis 300's. With that said, I have auditioned both the Genesis 200 (not the 201) and the Wilson Maxx Series 1 (not 2). I concur with some of the posts above regading room size being an issue for the 200's, but would also point that that 18 x 14 is a bit on the small side for Wilson Maxx's as well.
As to specific comparisons, in the systems in which I auditioned these speakers, the Genesis presented more of a Row M sound; also, the soundstage started well behind the main panels (maybe 3-4 feet). The soundstage presentation on the Maxx's was more up front. Images were also bloomier with the 200's, whereas the Wilson's presented more of a pinpoint representation of individual actors on the stage. On large scale orchestral pieces I felt the Genesis nailed the spatial presentation, but on smaller scale pieces (e.g. solo female vocals), sometimes images tended to be a bit overblown. The 200's sounded more coherent through the midband, whereas I felt there was a discontinuity with the Maxx's in the midrange. Both speakers had extended treble responses, but I felt the Genesis sounded more natural, with the Wilson's a bit edgy. The Maxx's had an emphasized midbass, which added an unnatural richness to the sound on some pieces. I also felt the Genesis had more low end authority, and ultimately better bass extension. I wasn't particularly thrilled with either speakers' resolution of low level detail - the Wilson's seemed to have an emphasized upper midrange/low treble that highlighted detail in an unpleasant manner; the Genesis tended to obscure some low level information. Neither speaker excelled at low volumes - both seemed more pleased when you put a good amount of juice into them. As to macrodynamics, both speakers excelled - I couldn't pick one over the other. Finally, if fit and finish is an issue for you, the Wilson's look much more sturdy, and more well constructed.
Given that you own Genesis V's, the 200's are very much of the same sonic cloth, but give you much, much more. The soundstage is more expansive; the bass is tighter, but with better extension; dynamics - both macro and micro - are also improved. In short, the 200's are better in every sonic parameter; in some cases, by a little (low level resolution), in some, by quite a lot (soundstage).
As I read over my synopsis, I realize I focused more on what I found to be these speakers' weaknesses, as opposed to strengths. I don't mean to say these are not good speakers by any stretch; rather, I did so in an attempt to get across their differing presentations. Indeed, whether others agree with my individual perceptions or not, I guarantee most would agree that these speakers' sonic presentations are quite different.
One last point - I know it may in principle seem like a step back from the speakers you are considering, but given your room size, I urge you to take a look at the Genesis 350se and/or the Wilson Sophias. I think both speakers give you a good bit of the benefits of their respective higher end models, but are more tolerant of a smaller room size (I also like the Sophia's presentation much better than the Watt/Puppy and Maxx's).