Probably the one I call "Mind The Gate":
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I like not knowing beforehand what I'm going to have to play - it makes games more interesting. And I also like winning by using my opponent's strategy, except with more cards than them. If they've got one Light Dragon, I might have 6.
It doesn't have the highest win-rate, but it is a lot of fun.
In the same vein, there's the one I call "OMG! That's, Like, Soooo Random!":
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Never the same game twice.
Of the two, though, I use "Mind The Gate" much more frequently.