As I said above, openSUSE won't fall back to AIGLX after you remove XGL. You'll have to configure xorg.conf appropriately. But as long as you do that, and select compiz-fusion from the repos rather than the 10.3-core version of compiz, you'll be fine. And if you don't use compiz anyways, there's no issue. XGL and AIGLX aren't relevant if you're using a standard desktop, and there is no benefit from either with a standard desktop.

I understand where you're coming from, particularly since distros like Kubuntu were flexible enough to handle both types of compositing. Frankly I was a little surprised that 10.3 didn't have built-in support for AIGLX, but at the same time, XGL was Novell-spawned and at the time, the compiz-fusion didn't exist, so with a choice between using the version of compiz that Novell developed and supported in-house (as well as relying exclusively on XGL) versus the flaky-at-that-point-in-time community fork, it sort of makes sense.

The instructions on the wiki make it fairly painless, and cyberorg has done a fantastic job of packaging the latest stable versions of compiz-fusion for openSUSE, so that's your best route to go if you're looking for non-XGL wobbly-window goodness...

If you don't want compiz window enhancements, then it really doesn't matter either way.

Hope this helps?

Cheers,
KV