Random - but it's already been done 3 days ago as I mentioned in the other post.
stratum.kano.is is 3 nodes, 2 in Oregon and 1 in LA.
It's random which one you end up on when you connect.
While the LA one is 30ms further (for anyone closer to oregon), so far it also happens to be better at holding connections.
As I said in the post the other day,
They're 30ms apart but that's OK for this 'trial' run.
This is to see how well it performs and if all goes as planned I'll probably do some more changing around of stratum.kano.is in a few weeks.