Late to the party posting (my office blocking this site has really reduced the amount of time I spend on here; used to be every lunchtime...waves fist in the air...)
Was too late to vote, however as much as I'm biased toward Metallica, as others have said, you can't really go wrong with either machine; both great games.
If you aren't a diehard fan of either, I'd suggest getting whichever one one comes up first and then after a while trading for/towards the other?
If you can, also just play both loads on location if you can; one will likely stand out as something you'd love to have at home.
My thoughts on why Met is so great (pro or prem) - note, just my opinion/I'm biased as a fan of the band for nearly 35 years:
Sparky multiball+grave/MOP start up never gets boring (I love games which have a build up to a multiball; nice breather before chaos!..)
Some of the best call outs "Jack f'in pot!"
Loads of great modes which kick in pretty naturally as you get good (seek&Destroy, lady justice etc)
Metal ramps with the red lamps underneath are slick.
Crank it up modes don't seem to get boring; always tense and can always do better - cashing out feels great
Smashing the captive ball (hammer block on prem) for hurryups feels very satisfying + way it's worked in to Lyman's rules is brilliant
Going for the add-a-ball during multiballs and hitting the snake shot feels awesome (even better on the prem and one of the bigger advantages over the pro)
Hitting the right scoop for extra balls/crank it up always super satisfying (nothing special about the shot; just feels great
Smashing orbit shots and combos; feels awesome and can get very fast.
Artwork, music and lightshow; all brilliant (lighting even better on Prem)
Edit; forgot to mention
![Smile :-) :-)](https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f642.png)
..
Dmd annimations, especially with colour dmd are great.
Must admit that once you know the game inside out and really know the rules, it can feel a bit like you've seen everything, but I liken it to a classic old school arcade game where you really hone in on trying gto brat your high score/modes scores, rather than following a story/leveling up or whatever.
Have to take a break from my machine once in a while to try and keep it fresh, but I'd imagine that's always the case with only being able to have one machine.
Would be interested to see what you end up with; either way you'll have a blast.
Have only played Deadpool during comps (premium I think), but it's great and the animations are cool
![Thumbs up: light skin tone :thumbsup_tone1: 👍🏻](https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f44d-1f3fb.png)