Fat double stability comparison.

I’m looking at getting a fat double like a Nelo 600, V8 double or Fenn XT-s.   An anyone compare the stability difference between them. In particular the Nelo and the V8... 
i had a V10 double for a few years and it was fun with another solid paddler in a good blow but not fun with a beginner even in the flats.  . I’m looking for a ski to take out beginners in downwind and options other than a V8 double. 

Haven't paddled the Nelo 600.

XT-S double is pretty stable, reasonably fast and actually manoeuverable in a decent wind/swell
V8 double is a wetter ride for the person in the back, feels a bit slower and barge-like, not as manoeuverable as XT-S

I guess it depends on the conditions, the person in back and the person in front but I think an XT-S double is pretty good for beginners and then some.