I'll add my two cents to KC Swan. We are a PTO and have been forever. If were starting from scratch, that would likely be the route I'd choose...HOWEVER, be sure you do so with your eyes wide open. KC makes some valid points.
Independence is a two sided coin, serving simultaneously as the PTO's greatest strength and its most dangerous weakness.
Being a PTO, you save the national dues and avoid following someone else's rules, but you also forfeit the structure. The PTA provides advice, committee guides, officer training, procedures, and program ideas galore - a valuable assets to build your group and to fall back on.
You can do it all on your own. PTO Today is a great resource, and those of us on the Forum will help you. Just know what you are getting into.
We re-started our PTO 3 years ago from scratch with nothing much more than verbal history and erroneous information. (Sure, we were a 501(c)(3) - the fact everyone believed that didn't make it true! Oops, that ID we were using was invalid? Who knew? No cash control proceses, hmm suppose that had anything to do with the missing $1300?)
I KNOW that in the previous 15 years there were some great officers, records, event history, budgets, etc. - but we had nothing. It's so easily lost with just one year of lax officers who don't understand the importance of paying sales tax, keeping track of how an event was run, filing for bingo so the games are legal, etc. I painstakingly documented as much as a could while president, yet some of those binders have already disappeared. And sometimes it does feel like our group spends too much time "reinventing the wheel".
Don't get me wrong, if you are a PTA - you have some of that responsbility as well. But at least there's a governing group with resources and standard processes should you need it.
This email sounds almost pro-PTA, anti-PTO. That's not the case at all. There's no wrong or right choice. Just make sure you weigh all the factors either way and make an informed choice.
Good luck!