Rotary hooks are useful with very light weight or stretchy thread. The stuff used by most of the diy crowd is middle of the road. Oscillating hooks are best for heavy or stiff threads, but both function fine with Tex 27-40 thread.
As for a better stitch or not, there are times where a rotary hook is superior, but those typically involve very light threads with lots of stretch (woolly nylon or UT 151).
That said I wouldn't recommend using a 60mm oscillating hook for 1.1 nylon, but those are typically found on large clearance walking foot machines.
--If a cow laughs hard, does milk come out its nose?