Good question.

In theory, for large single uploads, they should be pretty much equal in speed. I actually did some speed tests between the two (helping Mike with HSX-109 support in Jemplode) and discovered that they were more or less identical for the uploading of each individual song to the car player via ethernet.

I did not do any testing to see about the between-song latency and database-fiddling parts. So I don't know about that aspect.