You can't beat the wet clutches, but with that said, I'm not sure that they are needed.
A dry clutch can last a long time. The Kubota has faster loader times, but again is that needed or even wanted? My 7520 is plenty fast for me, not sure if I would want a loader much faster. Part of that may be technique though. You mentioned weight as a double edge sword. With a tractor of this size, what is the down side of weight for your application? I know for me, mine still is not heavy enough and it's over 12,000lbs as I work it, but then that is me in my conditions. I don't know how Mahindra lists their front axle, all I know is that mine always spins both front tires.
As far as options. get the following, you won't be sorry in the long run.
Skid steer quick attach
3 rear remotes
a canopy (dealer item)
Top"n"Tilt if you are going to to any grading (dealer item)
Kubota has a hydraulic self leveling loader option that can be turned on & off as I understand. That would be very nice. Mine is on all the time and as I understand it, is no longer available.
If you might get a grapple, think about the control for it. Yes it can be added later, but it is easier at tractor ordering time.
I'm probably forgetting something,
but these are all more things to think about. I looked for a tractor for a bit more than two years, it is not an easy decision to make, especially, when it is the first one of this size. I wish that I had found TBN sooner, it would have made my search faster and easier.
I need to go out and get some work done, talk later.