Hopslam is my #1, so when I went to San Diego a couple years ago to try Pliny, I went in believing it couldn't dethrone it. While Hopslam still remains my #1, I really enjoyed Pliny. Very easy to drink (a bit easier to drink than Hopslam in terms of alcohol feel), but I feel I like the hop profile of Hopslam a bit more.
But, it probably depends on the person. I get Hopslam every year (I'm from MI) and only get Pliny when I get to SD.