More importantly, what do you hold onto after you right the boat?
Not the dolphin striker if it is a Marstrom - they are a skinny carbon fiber strut designed to be in tension, not side loaded or twisted. I grab the front cross beam as it rights and climb on board.
I don't think the loss of the dolphin striker makes it significantly harder to right or remount an A-Cat. Now as for the performance advantage/disadvantage - given new boats generally are down around min weight, strikerless may have an edge in reduced drag.
Chris.