The Mayor
+1y
I had Firestone's on my truck, switched to Slams. The Slams have more lift and load carrying capacity, the built in bump stops are a good feature for me as I don't want my truck to lay frame. The slams just seem to be the better choice in all categories. Yes the Stone's will compress more, the 2500's I had went to 2", compared to the Slams at 3" compressed. I don't know if there is really any difference in reliability though.
Like everything else in life, personal preference will play a big factor. Until you've tried both for yourself it's hard to know what you'll like better.