Get the B. You've done to much thnking and pondering and researching to go with a BX like what you have. Get the B. You'll wonder ever day with a BX if you should have gotten the B. Bs aren't quieter than BXs. The Bs aren't as smooth running as the BXs but get the B. I used the same post hole digger on the Bs and BXs. Get the B. HGigher ground clearance.
John, you are funny. My BX is a high idle marble shaker. I know the B3300 QA fits the LA364, but are there options for the front blade like the BX? I haven't seen one.
The more I see on implements, it's probably only a tiller and core aerator I'll ever buy, so the lift issue of a BX is mute.
Unless the new B's are substantially different than my old B7500 and B7510, I think I know what to expect. I need to figure if bigger is better. Especially on 2 acres.