I think the backhoe is the most useful at least in my case as it has about 3 times the hours of the other machines it simply sees more use. Haven't really thought about whether the fel or the hoe gets the most use on it.
Kubota B26, Allis Chalmers D17 series IV and an Allis 170, Kubota ZG-23 Mower, Kubota ZD 1211, Kawasaki Mule 610, 2 Stihl 361's and a Stihl 660 Ported and tuned
It would have to be the loader. It is very versatile and I never stop finding uses for it
FEL-given
Ratchet rake-love this thing, clear brush,rough trim tree limbs in pasture, clean up roads every yr
cross cut disc
brush hog
post hole digger