Thanks for all of the responses...it's curious why B of A wouldn't just make the perks to the 2 cards identical, it seems like most everything else about them is.

In any case...all of your replies have generated only this question - when you say "easily tracked separately", is there some sort of tracking and itemization that the business version does that the signature does not do? Or could my parents each apply for a signature, and use one of their accounts strictly for business purposes, and the other for personal use, thus accomplishing the same "tracking" goal?

On a totally unrelated side note...I am counting my blessings for being an AS MP member. I've been on hold with Delta Skymiles for about 90 minutes...granted, I call the AS gold line and never wait, but I think that other than for the Christmas weather nightmare, even the regular AS number gets answered in WAY less than 90 minutes. It seems my grandmother let her Delta miles expire last month...and now I am trying to help her get them back. It would appear that I have become my family's travel assistant tonight...