In terms of kits.....
While 1/72 will give you the largest possible range of aircraft and I can already think of multiple kits of Bulldogs, Demons, Furies, Heyfords and the like, if you want to put them on the table they will be far too big.
1/144 requires a lot more digging around, although there's a lot more out there than most seem to think. Much of it however will be short run kits or multi-media which means you will want some reasonable modelling skills and more often than not a good deal of patience.
I'd personally go with resin printed both for ease of construction and availability. Apart from the mutitude of printers and designs on various platforms there are manufacturers that produce primarily in this scale. Minairons produce both the Bulldog and a Fury in 1/144.
https://minairons-news.blogspot.com/p/1144.htmlOf course if you print yourself or know someone who does you could knock them out at 1/100 which is closer to true scale for 15mm.