IMO stay away from the self contained 3ph mounted hoes. They're more of a pain than they're worth. Stick with Kubota. Resale, at least in this area, is considerably more with OE Kubota implements and attachments as compared to, say, bush hog or koyker or woods. They're all good machines and attachments, but for some reason people will pay more for them if they have Kubota attachments and implements on them. Also, your Kubota dealer will work on your Kubota with a BH92, but they might not work on your Kubota that has a Koyker on it. Aaannnddd....if said Koyker has a problem, or is built such that it damages the tractor, Kubota WILL (guaranteed) deny helping you, whereas if the dealer installs the BH92, and something breaks, Kubota is MUCH more likely to help you. Worth mentioning, at least in my opinion.
And yes I've dealt with some of the aftermarket stuff. Most of them are "universal" meaning that they don't specifically fit, but "will" with some "adjustment". Pain in the backside sometimes.