In 2013 I went from a 1996 JD 425 Garden tractor with 54" deck, front snowblower and blade to a BX2360 Kubota with Loader, 48" front mount snowblower, 54" mower, 48" box blade and 60" back blade, plus a few other 3 point hitch (3PH) attachments.
What do you use the Kubota L2250 for? Does it have a loader?
I found the 54" BX MMM (mid-mount mower) to be as good as the JD deck. Like
@Sidekick, I use Gator G6 blades, but didn't have problems with OEM. Gator blades were cheaper than OEM at the time....
A BX will do a lot more than a x570. I have a 48" box blade, and it's probably my most-used behind mower and snowblower. Takes a little getting proficient with one, but is super. Literally has saved me $1,000's for yard work I would have otherwise had to have contracted. With the loader, I can re-surface my stone driveway with 20-40 tons of stone in a morning......
Again, looking forward to hearing what you use the L2250 for. That's a lot more tractor than a BX. A BX's capabilities might leave you lacking.
Love my BX, but I've looked at B-series Kubota's multiple times over 12 years. The B2601 would likely be my next, but don't know much about their MMM. Love my BX, but should have bought a (slightly) larger B-series the first time.
If you want a box blade, you definitely want a loader. Price hurts at first, but re-sale of a loader tractor is much better.