WoW Classic, TBC, or WoLTK?

Which do you think is the best?
Put a reason other than the level differences...I personally like the classic better simply because the environments looked better than let's say...Hellfire Peninsula or Shadowmoon Valley.
I liked the bosses a lot better, the epic quest lines, and the way the gear looked.I seriously hate it when I hit 60 and I have to go to outland. Everything just blows.
I must say that Northrend looks a lot more like the original, with the exception of giant humans everywhere, and frosted dwarves. lolI loved Searing Gorge, the Thorium Brotherhood, Burning Steppes and Winterspring.

my favourite zones environment wise are mulgore and nagrand. I also quite like grizzly hills

Zangermarsh was one of my favorite zones environment wise, but I haven't visited Northrend yet =/