As far as the mowing chores go, either of the B series that you are looking at will handle the chores with reasonable ease (60" finish mowing). Other chores and duties may steer you toward one tractor over another.
You might ask the question "How many people use the
B2150 with turf tires to finish mow the yard?". Why ask this question? Because, according to the sales brochures, the 4-cylinder 24hp
B2150 is almost 100 pounds heavier than the 27hp B2700 (I found that to be quite a surprise, but I have not seen that fact mentioned on this board). I believe that there are a lot of people who have used the
B2150 for the majority of their finish mowing.
The
B2410 is the only Kubota to currently offer "Bi Speed" turning. That feature also increases turn-radius maneuverability quite a bit. You'll have to ask those who have had it if it is worth it or not.
You sound like you'll want to disconnect the loader to keep the weight down while mowing. I believe that there is a slight problem disconnecting the loader with a mid-mount finish mower installed (I think the complaint was "the mower gets in the way of the support legs coming down" or something like that. It was mentioned on this board sometime in the past).
Info for 4wd HSD Kubotas (from sales brochures):
B2410=1477 lbs
B2150=1828 lbs
B2700=1741 lbs
B2900=1763 lbs