I like One Piece the most. It has the best filler of all because I adore the characters in that show. So 700+ episodes doesn't bother me that much, because it has characters I care about.
Hunter x Hunter I tolerate simply because it has parts that I loved in the manga. Have yet to see them in anime form, but tbf the manga had better pacing even with Togashi's constant hiatuses. Wish he'd get someone else to draw his manga while he works on the script instead, but he's too proud to let that happen. He'll probably die before it gets finished.
As for Naruto Shippuden, I never bothered to read past the Chūnin Exams. I stopped tuning in when I was well into high school (10+ years ago), so that says a lot about how much I care what happens to it.