How much Bartok solo music have you played? Having played as many concerti as you have, I'm sure you know that a concerto is a composer's way of showing off EVERYTHING they can do, both musically and technically. That being said, Bartok's pianistic writing is entirely unique. His combination of modal harmonies and dance rhythms set him apart from any 'comperable' composer. Prokofieff is not Bartok!
On top of that, Bartok's concerti are some of the hardest in the standard repertoire. His Second is considered one of the only concerti more technically difficult than Rachmaninoff's Third. Nobody played the Second. in fact, my teacher, during his 40+ year career, including some teen years studying and competing in Vienna, has never met someone who plays it; he's only met someone who's best friend plays it (I couldn't remember why he told me this to save my life, lol).
If you insist on playing a Bartok concerto, go for #3. Bartok wrote that at the end of his life, after he had made peace with a world that hated his art, and he was much kinder to both performer and audience in its composition. #1 may be technically simpler (I really don't know too much about the relative difficulties), but its music is less accessible to the performer. And for the love of God, read through the Mikrokosmos and learn the Sonata and Bulgarian dances first. The experience will be invaluable.
Topic: Help Selecting a Bartók Concerto