In terms of technical ability, Jessica can wipe the floor with Phillip. But as Jennifer pointed out, it's impossible to compare the two when their styles are so different; at this point, it will all come down to personal taste.
In my mind, there were two deserving competitors and two marketable competitors in the Top 3, and those pairs didn't necessarily contain the same finalists. I'll leave it to you to decide which of the three fit each category.
I gave up on being invested in the outcome of an Idol season the year that the phenomenally talented Adam Lambert lost to the pretty-but-bland Kris Allen, so I honestly have no horse in this race. But if I had to bet, I'd bet on Phillip Phillips.
Joshua dragged out a passionate rasp and grittiness that made you feel every growling note. By the end, he pulled out an eye-watering high note that was so pure and clear, it could've come from heaven itself.