OS X Outliner?

I’m trying to decide on an outliner to use on OS X. OmniOutliner came with my new computer, and there’s alot to like about it. But it doesn’t suit me perfectly, either.

If you use an outliner, which one? And why do you prefer it?

Me, I’m tempted to use MORE, because I still like it better than anything else I’ve tried, but I really don’t want to install Classic, so I probably won’t use MORE.