They're both very specialized, so in addition to their basic functions as navigators, they also offer advice in specific fields.
Pixter is used as a business counselor. He can weigh in on ways to save money and take advantage of financial opportunities wherever they may reveal themselves.
Hexxy on the other hand is programmed as a romantic partner. If you don't directly flirt with her things shouldn't be too weird, but she'll occasionally offer relationship advice whether you want it or not.
Hmmm... that's really all you have?
Yeah sorry. I used to keep all personalities on file, but they started heavily regulating the distribution of A.I. It made sense for complex personalities, but with these travel versions it's just a nuisance.
So which will it be?