Max tire size for Troll is 26x3", so not sure how small a tire you'd need on a 27.5 rim to fit in that space. Ogre can handle 27.5x3" tires.

So I think it depends on what size tires you want - narrower tires go with the Troll, fatter tires go with the Ogre. If you put the same size wheels/tires on both bikes, the Ogre's bottom bracket will be about an inch lower than the Troll's.