Hi Bomak welcome to the forum:
This spring I purchased a new New Holland TC29 and had it equipped with a new Woods 7500 Backhoe. This time around I went with the hydrs. plumbed into the tractors, with quick disconnects. This was after years of having the 3pt pump on my older kubota and hoe, wear out both the splines on my pto shaft and one entire pump. you see the pto shaft supports all of the weight of the pump. There are braces or chains the keep the pump from rotating, but they don't support the weight. So between the the inertia placed on it by the rotating pto shaft and torque applied by the hydraulic operations its always trying to run offcenter. you are also adding the weight of the extra hydr. reservoir and oil behind the axle. And the vents for these added tanks are very prone to pickup extra dirt, mud, water, etc.
Of course there are two disadvantages to having it plumbed into my tractors hydraulic system. The snap connectors are hard to reach and you have to make sure that you keep them clean. Can I live with that, you betcha!
Asks your Kubota dealer I'm sure he can have that Woods hoe plumbed directly into the tractors hydraulics. It sounds like he might be trying to make a couple of extra dollars by selling you the pto pump kit instead of the straight plumbing.
I think you will be happy with the Woods 7500 BH. It is powerful and rugged, yet easy to handle. I don't know what youre uses will be, but I would suggest the 12" bucket for trenching or stumping. And the 16 or 18" buckets for digging larger areas.
Good luck on your new purchase and happy hoeing.