Even though the school I dealt with left me with a bit of a bad taste in my mouth, environment-wise i think i got lucky, because they started at a towered field, opened a satellite school at a small uncontrolled field, then closed up shop there before I finished my training.
So I learned the basics at TEB (extremely busy NYC-area Class D under the Class Bravo)... delays, pressure, and all... we used to go over to nearby MMU (Class D)to do touch-n-gos, and my first dual XC was right thru CDW and MMU's Class D's to Allentown (Class C)... quite a mission for a newbie.
Just when my head was about to explode from all that I opted to go to Lincoln Park, where I got a breather from the fancy stuff and learned about the "aviator" stuff: treeline turbulence, NORDOs, pilots who have no business flying yet think they are the world's Greatest Pilot, hangar BS sessions, short runways, and taxiing in tight quarters. I soloed there, then soon after wound up back at TEB, where I staged my solo XCs from and also launched for my PP checkride. During that same period I probably split my destinations evenly between the non-towered fields and the Class Cs and Ds...I became quite comfortable in both worlds (as comfortable as a newbie can be, that is).
That's not easy to do on purpose unless you want to change schools mid-stream, but a good mix of all forseeable flight, ground op, and comm environments is the best way to go.
Pilots who earned their wings entirely under the watchful eyes of ATC, on huge runways with working toilets nearby are often terrified at the prospect of entering the fray at some little grass strip in the boonies somewhere... and of course, the guys who had grass stains on them after their PP checkride are often terrified of flying into a controlled airspace or trying to find their way around a big airport.
It's all a matter of exposure and perspective, so a mixture of both worlds will keep you limbered-up for flying anywhere.
As far as instructors go:I wound up going thru 5 CFIs on my way to the checkride (high turnover at that school for *cough* some reason), and it annoyed me at the time, but looking back... I was very lucky. They all had their own individual style and point of view, which greatly enhanced the syllabus. A couple were born instructors, some were drooling to get into airliners, and one- my favorite by the end- was an aspiring missionary bush pilot as well as an A&P.
And oh, yeah, there was one who was "off da hook"... hard to say what niche he fit into, but he was a very good instructor and tons of fun to fly with.
I wasted a little time and money with the inevitable review that comes with a change in instructors, but I managed to get that PP on a very thin blue-collar budget, and the varied experience prepared me well for post-checkride flying.