Can you try the comparison with 3.2.2 final rather than the RC4 release. Can you post the results here if possible :-)
Also I'm not sure how much it makes sense to compare app servers with their default out-of-the-box configs. Would seem to me you won't get any idea of the performance of either app server when doing so.
Don't want to add a critic to JBoss, but after using the two servers (JBoss and Orion), there's another advantage in choosing Orion... it's simply to configure.
I work with JBoss since 2 years now, and I'm always lost in all those configuration files and parameters...
Also I'm pretty good in those technics, we aren't all specialists and experts, and can't pass hours and hours to discover the perfect parameters that could boost our apps...
What I want from an application server is to be stable, fast, normalize and... simple to configure and tune !