Personally, I preferred to learn at an uncontrolled (A/G) airfield. It gave me more confidence to make decisions for myself, I spent less time hanging around (saving money), as well as getting me used to small runways early on. I found my first solo very daunting as I had to fit into a busy Saturday circuit pattern on my own, without any ATC telling me when I could take off.
I'm also a very low-hour PPL, but because of where I learnt, I'm more than happy to fly in to small grass-stripped airfields. The flip side to this is I have yet to venture into Class - D airspace. (Stanstead is a bit daunting !).
I believe it is a requirement of the XCQ that you have to do that one of the two destinations has to be full ATC, so you will definitely be taught how to handle the larger airfields.
However, the important thing is to find a school and instructor you are happy with regardless of where they are based, and talk to them about your concerns.