With fairly limited play on both, I think I'd go with Aerosmith.

While GB wins for me from a theme perspective...and maybe even sound...I had more fun playing AS.

If I didn't already own Metallica and Tommy, I'd probably be looking at picking up an AS Pro.

Just don't want to have so many music themed pins in such a small collection.

I've reviewed very few pins, but I felt the need to write something up on it after playing it at Stern today:

https://pinside.com/pinball/forum/topic/aerosmith-short-pin-review