I personally love the roll over element, it is graceful, smooth, more disorienting, and natural ,
the cobra roll is an interrupting kind of element , it just isn't very fun to do a cobra roll vs a roll-over
and i am a bit surprised that B&M makes sooooo many cobra rolls when their coasters are usually graceful and fairly elegant and the cobra roll itself seems to simply be a disruptive "asymmetrical" ( discursive , un-elegant ) feeling
maybe it isn't as much of an eye-candy piece for the parks but i do feel like its a much better element