The Obitsu slim male can wear Barbie's pants -- but Ken's clothes tend to be a bit big on him (he can wear the shirts, they're just loose). I like the magnet feet (because I do some insane posing for stories sometimes), but the Obitsu guy can usually stand without them (the Obitsu girl's feet are too small, she NEEDs the magnets, but the guys don't have that problem). The Obitsu slim male comes with extra hands (gripping hands and fists), which are nice to have, too. He can wear any of the slim male heads, or even the female Obitsu heads (with adjustments to the neck peg). A lot of Obitsu slim males use the W-3 Obitsu woman's head, to create the more youthful "bishi" look.
The Volks Neo-Goh is a bit taller, with better defined chest muscles, but doesn't pose quite as well -- the tightness/floppiness of the joints varies a great deal with the individual doll. Getting the optional (larger) feet helps their stability, the feet they come with aren't as good (but they fit very well into boots, so if you're going to put him in boots anyway, the default feet work better). The Neo-Goh also comes with extra hands, they're a little harder to swap out than the obitsu, but still nice to have.
Obitsu slim males and Volks Neo-Gohs can swap heads and look pretty good. I'm personally not as fond of the eye-hole heads on this scale, so I haven't tried those -- all my guys have painted faces.
I also like the 'standard' guys for both Obitsu and Volks, but they are much more like action-figure bodies, a bit more muscular (actually, a LOT more muscular for the Volks). Both pose very well and stand very well. Additional hand styles must be purchased separately. Note: Heads for the standard guys are
not interchangeable. Unless you're really good at modding, make sure you buy the right head if you get one of the standard males.
(For pictures, I've got a
running photostory series under "Photostories" on this site, with all types of dolls).