That's a bit harsh Grantura.
It's more like comparing 2 different kinds of apples. The B is bigger, significantly more leg & head room. Engine is bigger which gives you more power/speed (okay, I know, we're talking MGs here!). We have 2 MGBs. We nearly bought a Midget first, but at 6', 220 pounds, was a squeeze for dahubby to get in and out of. Our B is comfortable for long trips as well as short jaunts.
On the other hand, I've driven Midgets and my son owns one as well. They are an absolute blast to drive. I love the handling, the responsiveness. Something there you just don't get with a B.
Either car will be eaten by the rust maggots equally, particularly if you're driving in the winter.
If you have no preference, buy what you can get the best deal on for the money you want to spend.