zorro, I use a strobe tuner by TC Electronic called a ‘polytune’, fast is the word. My Peterson has been in it’s can since I got the polytune a few years ago, highly recommend.
I’ve seen the JT tuning video, he tunes that way to allow for his capo.. not for everyone and cents (+/-) don’t matter if guitar is tuned to it’s harmonics.
After tuning to EADGBE, this video by Justin Guitar taught me how to fine tune, been using it for a good while now. Guitar never sounds right when the harmonics are fighting. I use harmonic tuning on everything with strings… bass, reso, archtop, flattop, etc.