This is just my opinion so take it easy

I don’t like mootools, jquery is really better.
I studied both frameworks and I must say jqery is the winner for me, although mootools does it’s job also.
But jqery is technicaly better, better documented, more stable (that matters), and more cross-compatible.
I wish modx was using one framework only, to do all these web2 stuff and IE-fixing.
I mean jqery is extensible. WE could write extensions that make it CUSTOM and modx optimized.
--------moooOO---lol
Okay, I think I need to say this, if you don’t.
I used moofx from it’s beginning, then I heard that the dev was about to code a AJAX forum.
I was happy to hear that, but months later when I asked just a simple question (Can I get alpha/beta access, I’ll help you finding bugs.) I got flamed and that was not good. From that on I’d a strange feeling when using their "js".
I’ve to admit that there are some people, who really make very nice products and even for free.
But there are some black sheeps under those programers!
I don’t want to tell names, but I hate people acting arrogant and living like: "I’m admin you’re nothing!"
Be nice people and alle you get is nice! But beeing rude, makes things just worse.