Which version of Heroes do you like the most?

I've been playing the third game for a long time. I tried the fourth one, didn't like it, thought maybe I wasn't understanding something, needed to figure it out, played it some more - didn't like it even more :-)
The fifth one is not bad, but I don't perceive it as a full-fledged turn-based strategy.
Yes, it's beautiful, but the gameplay is a bit sluggish behind the beauty, and the third game set the bar for the game very high.