[CentOS] CentOS 5 - base kernel vs. centosplus for XFS

I notice that the same versions of kmod-xfs and xfsprogs etc. are in
both the extras and centosplus repositories for centos5.

Is there any particular reason to use the centosplus kernel if what
I'm primarily interested in is XFS filesystem support?

I presume that if I am using the plus kernel, then I must use the plus
versions of kmod-xfs etc., but I'm wondering whether I need the plus
kernel in the first place.