For those who have suggested the stouter L series, the OP asking about cutting grass and given the OP's comparison question about B series, it seems that's where his interest is focused. Do people cut lawns with an L? I honestly do not know.
Of course, an L and a riding mower of some kind might fit the bill, but that's another discussion.
If the OP had found they REALLY need substantially more tractor than a BX, then they have a job/needs that really are too divergent for one tool to do all of them well.
For example... Asking a single machine to do large earth works, plow, finish mow, have a 10' backhoe etc... is not going to get you a machine that will do all of those tasks well.
If a BX/B isn't going to satisfy the loader/3-point implement needs, you will likely be MUCH happier with 2 tools to cover the range of jobs.
With many of the mid-mount mowers at $3,000 that gives me a heck of a budget to get a really nice riding mower. Plus in my house the wife won't willingly run the tractor, but I'd expect she would be much more likely to run a small easier to use mower. That would give us the ability to do more work in less time as there would be two machines running, and two tasks would be getting done at the same time.
I agree two machines is a different discussion and the OP might not have the space to store, or even the want for two machines. But if you need a 1 machine solution, and the needs call for grass cutting, then its the B all the way. But you'll have to live with less loader, less weight, and less traction.
If you get to the top of the B range, the 3200, you are VERY close to the L in overall dimensions, weight is only 600lbs different, and I'm not sure the
B3200 with loaded tires, is going to be noticeably lighter than the
L3200 with unloaded tires.