[LAU] need some advice before upgrading JACK

Greetings, 64 Studio 2.1 is a wonderfully stable and reliable system, one I've used profitably for quite a long time now. Alas, it's definitely out-of-date, and its version of JACK is the lamentable 0.109.2, and it's causing some problems with AVSynthesis that I'd like to finally resolve by upgrading JACK. I have 64 Studio 3.0 beta on my laptop, but I don't plan to upgrade the production machine until 3.0 reaches a stable public release. Meanwhile I'll be pleased if I can safely upgrade some of its components. Here's the question: I've successfully compiled JACK 0.116.2 and JACK2 1.9.3, so in the opinions of my fellow LAUyers, which is the better choice for this system ? If I move to JACK2 will I need to recompile my JACK-savvy apps ? (That's not usually a problem.) I await the dawn. :) Best, dp