I have both Met Pro and ACDC Prem for years now. Probably would lean towards ACDC for my number 1 spot. I had very little time on GNR but wasn't overly into the play of it. Just didn't like the layout of it.
I'm ready to swap out some different tracks on the Met though. Iron Maiden is on the horizon for me over GNR for sure. I can deal with IM music in the pin but wouldn't listen to it while cutting the lawn. The gameplay is just fantastic.
You just got to get out there and play them.

Prefer the chrome trim which came on my Met Pro when picked up nib. I still have to put my Pinball Refinery purple armor on mine but will stick with the chrome head trim. Both my Spiderman and Tron came with the chrome head trim and these look good with the chrome trim. The chrome head trim on these two pins actually go all the way around. But these both were the older head styles from Stern.