You sound a lot like I sounded awhile ago lol. I love IMDN, my pro is bolted to the floor. After reading about the issues the Premium has, and playing both it and the pro, I found the pro just played smoother. I love the theme, love the music, love the rules.
I had BKSOR Premium for a little while, and got tired of it. I don't know what it was, but it just got boring to me. It's a great pin, but it ended up not getting played much and I traded it for a BM66. Since the trade, I would say 80% of the games played are on it. It's an amazing game once you get the rules down, and hour long games are a normal occurrence.
I'm not sure I could choose between BM66 or IMDN. They are both great games for different reasons.