Another person’s two cents worth: I tried the approach of using a local school for my basic training, which consisted of a couple of hours lesson every Saturday morning, and lots of reading and studying. At that time, instructors came and went, often getting hired by the airlines or corporate shops. I found I changed instructors frequently, but what was worse was the slow pace of advancement due to flying only once a week. For my instrument rating, I took time off from work and hired an instructor to teach me full time. I found the accelerated approach much more efficient…what I learned in one lesson did not have to be reviewed or learned again…it was immediately reinforced and practised under the accelerated approach. If finances are a factor, I’d say the accelerated approach is the way to go.
I always appreciated having multiple instructors, and frequently use different instructors for my flight reviews and/or aerobatic training. Something different and important is gained from every instructor.
But there is no question in my mind that having an older, experienced senior instructor for most of one’s primary training is the best way to go. I would opt for an instructor with 8000 hours and every known rating, over a younger, less experienced instructor, irrespective of whether it is in an accelerated academy setting, or by weekly lessons. I am close to your father['s age and have found that much younger instructors (i.e., early twenties) are usually too deferential toward me because of age. If I do something really stupid…I want the instructor to rap my knuckles, figuratively speaking. The older guys don’t hesitate to holler at the student!