> Those are harder to port as long as you created it on Google Voice.

I hope this myth goes away soon. It is trivial for any bad actor to force-port a number, even if it is reclaimed a day or two later. If I wanted to get fired, I could yank your GV number (which is, most of the time, really at Bandwidth.com) in a few minutes; the medium-sized voice provider I am at does several of these types of ports a week to help customers trying to leave recalcitrant providers.