I’m running Dugast Rhino’s when it’s muddy, but I do think the FMB carcass is nicer to ride on, having had a set of Rhino treads on FMB’s in the past.
I’ve tried Challenge of various types & they’re ok, but nowhere near as supple as the others, but do the job when it’s drier & that matters slightly less.
Schwalbe Racing Ralphs would be great if they were slightly wider, as they’re narrow for a 32 & I’ve had puncture issues in the past.
Glue them well, try & rush it & it’ll show when one rolls-I use the standard method, but generally four layers of glue on tub & rim with 24 hours between each layer until the last one on the tub, do that & bang it on!