jQuery ft Prototype

It's really hard to choice. Easy (to me ;) in developing and understanding jQuery as AJAX/javascript framework. Or hard (as for me) but native Prototype.

When I wrote my own function in AJAX/JS I use jQuery (of course). But when you'll start using AJAX with standart pagination (for example) - easy to use - prototype with ajax.helper....

Now I seat and thinking about: may be start to study Prototype? Or start to write jquery.helper?  ;-)