for screamed metal vocals (withouth real pitch), slip editing works great for me. on the ends of words with 't' or 'd' zooming to death and editing the letters makes them sync. sometimes on long complex doubled takes, Vocalign works a bit easier. Like Aaron I edit or choose one tight reference and edit stuff on it, with slip or vocalign. Can sound really great.
for melodic vocals, I find it hard to cut in the audio and moves things around because the notes are changing. i usually use Logic Flex Editing in Monophonic mode and also slip editing.
for tuning I use Autotune EVO. I like to keep everything inside Logic, like ermz said it's a pain to open another software, bounce, ... I put the arrange window on my laptop screen and I expand the AT UI full screen on my big screen. Gives you a nice workspace. On the laptop/arrange window you can really see where you are in the timeline, much better than in the AT UI.
I prefer to editing the timing first and then tune. Sometimes the tuning creates weird artifact and I don't want to strech or edit those. Sometimes I put AT on auto mode on the track when editing the timings, if the out-of-tune-lity annoys me to edit the timing. Gives you also a nice preview.
does anybody know if the new Melodyne is still introducing a delay on the tracks ?