Okay now I understand.
Use the JSONP version, because that's what I'm doing.
That way our OPML will be the same. :-)
I don't think there's any right or wrong way to do this. But you have to pick one and stick with it.
If there's a crying need for both, we can add that as an attribute, but let that be driven by demand.
Right now it's just you and me.