Yeah, each movie of the original trilogy definitely CAN hold a candle to each other and to its own - they're all equally strong, yet very different compared to each other. So yeah, it all depends on what mood you're in and what kind of movies you fancy.
I'm not a big fan of action movies and indisputable story arcs and fast-paced narratives with clear trajectories. I like slow movies with endings that are open for interpretation, melancholic, bittersweet, status quo-esque or just downright sad. Movies with hero(es)/heroine(s) that are superhuman and completely pawn the enemy make me root for the antagonist(s)... Every time an elf or human were snuffed in the LOTR movies, I sheered! During the movies I hoped that Legolas, Eomer or Aragorn would bite the dust, even though I have read the books a gazillion times.
In my fan-edit of Aliens Ripley & Co hit the cryos right after the atmosphere processor nuclear blast - I can't stand the Queen vs. Powerloader fight because to me it's so incredibly stupid and on top of that it doesn't fit the established 'realism' and reality of the Alien universe.