Personally, I don't care for
Pathfinder. And that only comes out of my dislike of D&D. Frankly, I think gaming has come a long way since the binary result you get from a roll of the die D&D and Pathfinder embrace.
It's an anachronistic holdover from the infancy of role-playing games. It's kind of the same reason I don't like anything Palladium publishes, it just feels so antiquated and clunky.
Were I to use a D20-powered game I'd give
13th Age a whirl. It embraces a lot of the indie advancements
Pathfinder and D&D eschews.
Personally, for a fantasy game, I'm in love with
Shadows of Esteren and I wish more people knew about it. Die rolls still end in a binary result, but how much it de-emphasizes dice rolling altogether is a breath of fresh air. Basically, from a game perspective, if you need to roll a die you messed up. A die roll is your last resort.
Of course,
FATE is fantastic and I'd love to do a fantasy game in it. There's also the mechanic that
Edge of the Empire uses which also give you a succeed/fail result, but adds a and/but result to the mix. So you can fail a roll and still get something positive out of it, or you can succeed on a roll but have a complication arise. These positives and complications are entirely up to player and GM discretion to determine what they mean (though there are vanilla mechanical outcomes to fall back upon should you desire). I think you'd have to play
Warhammer Fantasy to use the mechanic... though I can't think of a reason you can't simply rip out the setting information and use the mechanic any way you like.
I dunno, but whenever I hear someone say they're gonna play D&D or Pathfinder the question "Why?" comes to my mind. There are so many more interesting options out there!
You can check out Book 0 Prologue for
Shadows of Esteren for free
here. It was unlocked during one of their Kickstarters.