Using the Sugoi more today, cutting dead baygrape limbs, the increased size overall, including the teeth does make cutting hard dead wood a bit easier than the smaller Zubat. But still, a sharp Zubat is very versatile.
I guess on each end of the scale, Zubat better for smaller stuff, (doesn't grab) then they both overlap in the middle and the Sugoi handles larger harder wood slightly better.
I was given a free Samurai last year, straight blade, my hubby uses it on the ground for little cuts, its pretty good, so if looking for a slightly cheaper option you would do ok with that brand.