Both have advantages/disadvantages.
BXpanded is easy to take on/off (as I do for winter to put on bucket skids)
The Ai2 does have the advantage that you don't have to drill any holes..... and if you don't plan on taking it off (or not often) I think it may be the better choice.
I do have one of the only BX23s that has a pin-on bucket..... So I have the BXpanded bucket forks, and their tooth bar is designed for those forks.