I can tell you that I absolutely LOVE my Mystic Wand!! The charge lasts a really long time, it is very strong, very quiet, very deep & rumbly, and very portable & convenient! You can't go wrong with it!
Though, I did recently get a Pocket Fairy & I can't believe it's actually taken the Mystic Wand's place. Though louder & not providing as much coverage because of how small the head is, I've been enjoying the high-pitched vibrations more. The orgasms are more intense with the Fairy for me because of this.
I feel I just need a Fairy Rechargeable & I'll be complete between having the choice of that & the deep, rumbly vibrations from the Mystic. The Mystic has wonderful vibration patterns as well that none of the Fairy Wands have. It's a tough decision.
I'd say go with either the Mystic or Fairy & then save up for the other one. They're just different, but both awesome additions to the toy box!
I'll probably never get a Hitachi. Too big, too loud, not cordless, and I hear it can really desensitize in a way that other toys just won't get the job done after getting used to it. The other wands are PLENTY strong too!