All my bikes have triples. The only possible reason to prefer a double would be if you're in good shape and therfore don't need a triple.

Shifting patterns on triples are not all created equal, BTW. The 4 bikes that I ride regularly have different patterns. Two of my bikes have granny gears that I hardly ever use, but they're nice to have. On one bike, I hardly ever use the large chainring. My other bike has 3 cloesly-space chainrings, all of which I use.