I currently run a 27.5+ wheel set on a pivot les fat. For next year, I'm going to attempt the divide. I'm trying to figure out if it would be worth building a 29+ set. I am running a rockshox bluto front fork already. I need to get a dynamo hub, so I either need to build a new set, or get my current front wheel rebuilt.
Generally speaking you'd be better off with 29 x 2.2 or so. Most efficient overall for covering miles and miles of miles and miles.