Far as I can tell, someone wrote:
>If you make the espresso
>first, it will cool significantly while you're making the frothed milk. By
>comparison, the milk will cool much less, and it takes a very short time to
>make the espresso in any case.

Totally a matter of opinion. My Bezerra can froth 16 oz of milk in moments.

Espresso takes 30 seconds.

Which one you do first matters not a whit for 99% of the cap lovin' world, and I'd
bet anything you couldn't tell the diff in a blind test.