ST biggest downfall is the dead time in between missions. Nothing to do but try to make one of the 2 hardest shots in the game....and you have to do that 18 times! That said, the flow, sounds, music, call outs, and fun are top notch when things are flowing.
Metallica has the X factor; i.e. Lyman! Always something to do for the novice, advanced, and expert.
I think both are great depending on your mood. Metallica for skilled players, Star Trek for a journey and adventure.
MET PRO > ST PRO
STLE/PREM > METLE/PREM
IMO but cant go wrong with either.