I have both Sender Free 110s and BlackOps118. They ski soft snow exceedingly well and especially the BO118 demolish chop/variable, but there are def floatier pow skis out there. Their strengths are not in out and out float imho, but being loose and fun off piste. They are more in the snow type skis than float to the top.
I recently bought a pair of stock Jeff118s as well, and their shape / flex pattern suggest that they should outfloat the BO118s a bit. Their flex pattern is slightly rounder, they have less camber underfoot and more splay out front that rises sooner. They seem dialed. Keep in mind that 186 J118s (and all other remaining jeffs) are on sale over at on3pskis.com for 550 + shipping.
SF110s are good in soft snow, but I do find that their strength is shallower soft snow - not out and out powder. I think Jeff108s should float better, just like I think SF110s should outperform Jeff108s on piste (due to their core and titanal underfoot).
Both Rossis are freaking amazing skis. I will happily recommend either. BO118s (in the old construction with rubber tips) or SenderFree118 (the new construction - airtips + rubber moved further down into the ski) are both great skis for skiers that want something progressive, playful (under strong skiers) and that destroy chop.