The point I'm trying to make is that, in a low powered aircraft, the minimum size of the circuit is dictated not by choice, but by the performance of the aircraft.
Don't think anyone would disagree with that but there's no doubt that folk fly circuits that are far too big even taking into account a/c performance. IMO oval circuits (OK they're not really oval) are far more efficient. I did an experiment once at my own field in a 152. Three square touch and goes took me 15 minutes, three oval touch and goes took just over ten, bearing in mind my runway is 9,000'+ So if you were doing an hour's circuit training you would get an extra six circuits in. One of the other advantages of ovals is that you're a lot closer on the downwind leg so any donk problems are easily turned into a glide approach. The final turn takes a bit more judgement as you have to judge a 180 degree turn onto final rather than a 90 but hey, nothing wrong with developing good judgement.
Of course I fly whatever circuit is required at an away field.