The Epix and Fenix can both be paired with the C2 rower (and bike) so you can record not only strokes but distance and power. The Venu 2 and Instict couldn't do that in the past (maye they can now but IDK). Since accoprding to DCR the 265 can connect to smart trainers, the C2 trainers should be no problem...but maybe a new owner already knows what's what?!?