Congratulations for the designers of the top levels!
I nominated Heroes of Lemkind to this voteoff, because it stood out for me the most from the entire Lemmings Reunion for its immense enjoyability factor. In my case it's mostly subjective why I like this level a lot, so I can't point out accurately objective details, except maybe digger placement that geoo mentioned. This was a memorable, awesome looking level and really satisfying to solve.
Parking Garage was the clear front runner all the time, and it won its every round until there were 5 levels left. In the semifinal it got eliminated, which was a huge surprise. I would've voted for it all the way.
The crucial point in my solution for The Face of Evil felt backroutish so I didn't vote for it. No Time for Flying Toast was an amazing level, even though it resembled a bit levels I had played before, like mobius' Five for Fighting.
Oh, like always, I would've liked to see a full score breakdown of the whole voteoff.