Does anyone here have thoughts on the Alphafly vs the Vaporfly Next% 2? I have a pair of the original Vaporfly Next% that need replacing. I'm doing Boston on the 11th and have ordered a pair of both but haven't run in them yet (can't afford to keep both). I'm just wondering if anyone here has compared them. It seems like the pros prefer the Vaporflys but I've seen mixed reviews online.