Hahaha. This is a no brainer. If you go the ATP you will save about 15-20 grand.
I just finished the ATP program myself. Took me about 7 months. I stood ahead of schedule with my instructor. (The 9 months is just their syllabus and is a general rule). These other school would be way more expensive and take longer. Plus, their aircraft will not be as new as ATP’s. Every archer I flew was a 2015 or newer with glass panel.
Since ATP Instructor pay is crap, I just left to instruct at a better flight school once I graduated. Then, signed up for Envoy’s cadet program. (Choose a different regional if you want. I just liked their domiciles the best)