as much as I like both (and own a MET monster), I think that the metallica actually has a bit more to offer.
yes, ac/dc has some fantastic coding with different objectives based on song selection, and the encore mode, but the number of unique shots fall a bit short (compared to MET)
AC/DC Luci has:
- 2 orbits
- 2 ramps
- the "newton" bell
- the ac/dc drops (5 bank)
- tnt drops (3 bank)
- rock drops (4 bank)
- stand-ups (3, near ramp entrances)
- spinner
that's 10 unique things to shoot for. additionally, for as cool as it is to "fire" the cannon, that clunky mechanism gets in the way "seeing" the ball any time it's the right side, underneath it
metallica Monster has:
- 2 orbits
- 2 ramps
- the fuel lane
- the piston stand-ups
- sparky
- the grave stone drops (3 in-line) & the grave marker
- the snake
- the mystery hole scoop
- stand-ups (4, near the ramp entrances)
- coffin lock "newton" block
- hammer / under playfield coffin ball lock
- spinner
that's 14 unique things to shoot for. plus, the ramps are stainless, meaning that further down the road, unlike their plastic counterparts, will not get all scratched up where they obscure things which were once visible
they're both great games, but I've got to give the edge to the metallia pin