Rich_H: Would strongly recommend against a straight 3pt mount hoe even though your machine is a bit heavier than some with BH. The reason is the twisting forces from digging can crack/snap the tractor. I know of cases where this has happened. If it did, the tractor maker (KUB) could easily blame the BH manufacturer and guess who the BH maker would blame. It my judgment its just not worth the risk unless you had a 5000/6000 pound tractor with a cat II hitch.
The comment above on the Bradco is right on the money, also the comments on reach, although the only physical limit on a short reach is actual depth. A shorter hoe requires you to reposition the tractor more often. The Bradco system is elegant in design - a flat universal plate with 4 hooks bolts onto a subframe for the particular tractor (Bradco offers subframes for 55 or so different tractors - and Woods offers subframes for different tractors as well). So, you can "take it with you" when/if you switch tractors - keep the BH and just get a new subframe.
As others have commented on, the Woods 9000 is a lot more BH than the 7500. Also, you need to consider hydraulic flow. If you plan on using the tractor's pump you need to consider gpm flow. If you are going to use a pto pump (offered with Woods hoes, and others) you have more time for mounting/unmounting the unit.
I ended up with a NH BH for my NH TC40 (about the same size as your
L4310) even though I would really have liked a Bradco 511. Why? No warranty issues if there were any problems. The tractor's hydraulic pump flow on the NH is enough to drive the hoe. The subframe on the BH comes off with the hoe leaving the tractor "cleaner" - with the Bradco (and others) the subframe stays on the tractor. Also, the 3pt arms stay on the tractor even with the BH mounted. On, or off, time requires pulling/inserting 2 pins and connecting/disconnecting 2 hydraulic lines - a little more time than the Bradco, but not much. On/off time is 5 minutes or so.
JEH