It depends what you want it to do, tbh. DHR2 is knobbier, better in slop, but slower. HR2 I think is actually a bit grippier on the hard. But also wears pretty fast on the back and like the old hr can be a wee bit sidewaysey on braking. They both work pretty well and can cross over into each other’s turf but the DHR has the edge in slimy/scary stuff and the HR2 has the edge in more sensible stuff IMO.
Maybe I’m wrong but I think the DHR2 on the front thing is going to be a little bit of a thing of the past now, people mostly started doing it when there was a lack of good 650b and 29er enduroey mud tyres. These ideas have momentum (hence why people still use hans dampfs) but in wet stuff I’d always choose the shorty over the dhr2 and in drier I’d always choose the dhf, I’m not sure there’s a gap there.
Also, I think some people just liked the irony of going from dhf on the rear, to dhr2 on the front. That tickled me.