I didn't make my choice of M3/M4 based on any sort of comparison re:anatomic accuracy. Frankly, it never crossed my mind to do so.

When I first started in Poser, I looked here and at the other sites to see who had the clothing items I needed, and I went with M3 (then M4) simply because I could get a working set of characters/clothing/accessories that would work together. That was the deciding factor for me and, quite literally, nothing else.

I'm not sure if Wardrobe Wizard changes this equation. I know I use it (a lot!) and find I have almost everything I need by going that route. We can hope figure accuracy and quality will count for more going forward. (I know I'm sure excited waiting for YOUR character!)

Food for thought for the future.