I don't think I have a "favourite" body type, but some will interest me more than others. For me the pose and the circumstances of the crux are more important, something that shows the body off to its best advantage. real suspension crux does this, and a woman who enters into the spirit of it will give great images whatever her body type. We have great pics here of that type, example Vivian and Randy (Real Crux thread).
I'll just give a few more examples of what interests me
These two ladies have a lot going for them, full suspension which enhances the natural curves and shape of their bodies, and probably come close to being ideal crux victims for me
But nice shapes and angles do not require large breasts
And a small chest coupled with some rib action, a nice little bush and a good pose can go a long way
As can a slim or athletic figure and some visible muscle action (again a result of suspension crux)
The situation is also important, a body type which may not score a lot of points on it's own can be boosted by the setting, such as extreme vulnerability and humiliation
And yes there is always room for more mature body types, we see too few of them, and mostly in 3d or artwork rather than in photos. Thanks to Crumera for doing multi generational and varied body type recently, and to Andyman for his constant illustration that ordinary bodies on the cross can be very exciting.