Everyone else prefers Spearman and Fighter over Page.
Spearman have Hyperbody, Fighters have Rage.
You know what a Page has?
Nothing.
No party skills.
Sure, they have Threaten, but that really isn't much help to other people.
Other members wish to party Spearman or Fighters over a Page.
Not that I say Page is a bad thing, I personally wouldn't want a party relying on me to do something.
I even dislike when my party members want Haste from me.
If you plan on PQing and trying to gain levels as fast as you can by PQing, go for a Spearman, but I personally suggest Page, mainly because they can use swords, just as a Fighter can, and I love White Knight skills.
Its entirely your choice of course.