I've done all three, and flying private is still far different than what it was like pre-9/11. Back in the 90s, you still had to go through security checkpoint

I've done all three, and flying private is still far different than what it was like pre-9/11. Back in the 90s, you still had to go through security checkpoints, you just didn't need to take anything off, open anything up, or be touched/prodded/scanned except for maybe a metal detector. You still had to show up early, because they still checked people in manually and thus you traded long security lines for long check-in lines. They also were much worse about losing luggage back then, and if it was lost, if was gone for good usually. Private is another ballgame entirely. If you can afford it (or someone else is paying), and you don't mind the inflated carbon footprint, there's really no reason not to choose it.