There's no real way to answer that question accurately.
I have my favorite preamps for different things, but it really comes down to a per-case choice. I love a Neve 1073 on vocals, but every voice is different. Even two people who have similar voices singing / speaking the same style may react differently with the same pre. Also depends very much on the mic, and you can't really pick a mic until you listen to a few different ones on the talent.
Always good to have a variety of preamps and mics available. Once you have your talent there, audition a few different mics and pres until you find which one you like best, then stick with that one. If you don't, you'll likely have less-than-stellar results.
So yeah, it's really an unanswerable question. You'll do yourself a disservice by trying to nail down "the best preamp" for whatever situation.
In general, I tend to find myself settling on API or SSL for drums, Neve or Chandler for Vocals, and Avalon, Focusrite or Nagra for VO, but I also work with the same talent / artists frequently, and I tend to be a creature of habit once I've found something I like. So when I work with someone new, I have to go through the whole discovery process again.