I have had both over the years and it seems to break down to.....the big bad wild sterndrives were fun, but getting them to run on a regular basis was always a pain.....I am talking about the real exotic stuff. ( I realize it is different today, but)
So the outboards were always there, ready to run and take you out for fun with your family and friends whenever you want.
The bling factor goes to the BB, but the dependable boating everytime you want it, goes to the outboards.
I heard that the new Evinrude E-Tec's are maintenance free for three years from date of purchase.....can't argue with that.