29” is both fast and fun if you can handle it. The big wheels provide a lot of grip and roll great over terrain, but they also take up quite a bit of room within the frame, which generally means longer frame dimensions that make it hard to accommodate shorter riders.
Shorter riders with (generally speaking) shorter legs also benefit from having more room to play with towards the rear tire. It’s the same reason a lot of shorter pros on the World Cup DH circuit are choosing to go with “Mullet” mixed wheelsizing—on steep, technical terrain they need as much clearance between the rear tire and their own rear ends. Same holds true on the Stoic. Finally, for lighter riders the 27.5 wheels’ lower rotational weight will feel easier to handle.