Poles are probably my favorite. I also like Bows/Crossbows, staves & rods, swords/greatswords & Katanas.

I usually give Poles to Balthier or Fran, Bows/Crossbows to Penelo or Fran, Staves/Rods to Ashe or Penelo, Swords/Greatswords to Basch & Vaan & Katanas to Ashe.