Try to find one that has long average tenure (10+ years, if possible).
Yay teacher's union?
Really school funding and public education in the US in general is in a very strange place across the board and has been for decades
The results for a given teacher are poor no matter what the reasons, it's a bad "hey get a union" rallying cry IMO.
Government programs almost universally have higher overhead and more waste than private businesses. There is no incentive for government employees to improve efficiency, reduce budgets, or cut costs.
If anything, there was a negative correlation: The big corporate ones had high teacher turnover, more levels of administration, and turned a healthy profit for ownership/shareholders. They were priced to match.
Also, government run programs usually are less expensive (take pretty much any privatization program anywhere as an evidence). The government programs don’t have to pay money to shareholders, and aren’t siphoning resources for expansion, marketing, etc.
If government leadership is corrupt as we see in the US right now, then, of course, prices skyrocket, though that usually comes hand in hand with outsourcing/subcontractors/privatization. It’s hard to collect bribe money from civil servants…