I love 29+, I've had 5 bikes set up that way, starting with an OG ECR 10+ years ago. My current #1 is a Stooge rolling on 29x3.25 and 29x3 rubber, and I've won a couple local taxes like that. It can be surprisingly fast, and if you're into building weird rigid bikes, it's a suspension cheat code. 27.5+...never got along with. Less roll over, no perceivable, to me, benefit with the smaller/lighter wheel. When I'm not on a weirdo bike, 29er all the way...I've been that way for 15 years