Yeah I agree price is a consideration, however I think both organisations, PADI and SSI are priced pretty similar. I'm leaning towards SSI for some reason.
With regards to instruction, thankfully I've never came across a bad instructor, I'm sure they're out there but in general I don't need to 'gel' with the instructor, I'm more interested in being confident in their ability to deliver what the course states and confidence that they've got the skills and experience to put it across in a competent manner.
One of the things I did when I was teaching was to consider the Rescue Class as not only a class, but a service to divers.
My Rescue Class was roughly 6 hours of classroom, two 2-3 hour pool sessions, and 2 days of open water/onsite training at a local site.
I charged $175.00 for that and would put a class on for two people. It was the only course I lost money on, and I didn't care.
I usually had no problem finding volunteers to play victims. Or the distraught family member yelling at the "Rescue divers" and getting in the way, asking questions, etc.
Many times, those volunteers were former rescue students, tech divers, or dive pros who just wanted to get in the water and have a little fun. There were times when I had a couple of buddy teams for a class and might have made a couple of dollars or at least broke even.
There was always a mix of equipment. Single tank backmount, sidemount, doubles, and once a rebreather diver. Wet and dry suits.
In one class, I used the students to fill in extra info. Those students were an Army combat medic, a pharmacist, and a physician's assistant. All of them generously added real-world info not usually found in a run-of-the-mill class.
One thing I looked into but never worked out how to make it happen was getting a helicopter evac.
I never wanted cost to be a deterrent to someone taking the class.
I taught a few workshops where I only taught the surface part of the class for those who didn't think they could do the full class due to physical limitations. They didn't receive a card, but they learned to spot problems, stress, and anxiety, and how to help someone before they got in the water. That was usually a one-day thing, and we might get in the pool where I would demonstrate a few techniques. I charged 50 for that.