I think Raanta is the more talented of the two. What gets most people is that he consistently looks "out of sorts" even when he's in control, if that makes sense. He'll make an awesome, tough save, but then makes the routine stuff look very frenetic. I think that's just the way he is. Darling on the other hand is smoother, which gives the perception of him being better. If it comes to needing someone to make the tougher, more spectacular save, I chose Raanta.
This year I don't think it really matter who we have in net as our defense has been outstanding...and that's the most important thing. But if our defense reverts back to being sloppy in subsequent years, and past history indicates that it will, I think Raanta will be the better goalie for that going forward. I think he has the ability to make those frenetic saves (consistently) whereas I haven't seen that from Darling.
Honestly I don't think it will make a huge difference who we retain either way. We're in a really good spot right now.