The HD only comes in 2.25" for the 27.5.
My bad. I think William (imwjl) uses Bontrager tires but not sure what type, but I got the impression he likes them.
I have the Hans Dampf on my 26r, and mix Bontrager XR4 and 3 on my 29r.
Hans Dampf are super tires for Blue Mound but like all soft rubber tires will cut. Dumb a$$es often criticize a tire for shredding but the sticky rubber tires I've had from 4 different makers all wore or cut more than others.
I had XR3 front and back loving the speedy feel but the XR4 can be leaned over farther in loose stuff more like classic Maxxis models.
One way to look at Hans Dampf is faster feeling than sticky Nevegals but not the fastest feeling tires. Really good at picking your way through nasty stuff or general go forward traction but they don't just slide out from under you like a racy tire.
Bontragers seem to be designed for going fast but the XR4 have something to catch you when you lean over far more like classic Maxxis models. The Bontragers are not super sticky, but not bad. The advantages seem to be tread life and not packing up to much.
Confession: We might obsess about this stuff too much. In two seasons of teaching kids at Blackhawk I see they ride heavy bikes. Some of the kids are winners of the birth lottery and junior versions of their $10,000 on the hoof dads. Others are poor kids there via outreach programs. If I fill their tires so they have some flex and they have good attitude they ride well. I've found dumb a$$ dads setting up their wives and kids 50 - 65 PSI to go fast. If they show up without the dumb f's trying to do triathlon on dirt and I drop their tires 30 - 35 PSI they get traction and have fun.
One more observation. Some tires have to be leaned over more to hold you. It took a while for me to have the guts to do that. If you get used to that you can also wash out if the tire's too round.
Don't confuse old Bontrager tires with newer ones! I won some old XR3 that can't be compared to the current ones. The old ones have crappy almost non-existent side lugs and more of a cross bar pattern.
Also don't put the wide tires on narrow racing style rims.
To be honest, tubeless and running low air pressure have probably done more for me than the brand or model.