Interesting. I'm gonna buy either the Lonsdale in the 363-last or the Audley in the 337-last. I have shoes on the 348-last and I'll make the choice Audley/Lonsdale on which one fits the closest to the 348-last.
On the basis of this chart I would say the 363-last is closer to the 348-last then to the 337. Or not?
I recently purchased a pair of 348 Milton boots and will upload some photos of them shortly. Like yourself, I've been closely studying the rearranged last comparison chart above and am leaning towards the 363 Lonsdale too, for my next C&J purchase of capped Oxford shoes. Also, I'm considering the 341 Radstock too.
I do prefer the sleek looking (square toe) 348 last, albeit for my C&J Tetbury and Milford boots. I think the small round toes of the 363 last are just as sleek looking as the 348 last however, they are arguably more traditional (classic) in their appearance than the 348 to my (conservative / 50 years old) eyes.
Of course, this assumes the actual 363 Lonsdale shoes received are as they appear in the above last comparison chart. Good luck with your planned purchase. In my own case, I will provide an update once my new 363 Lonsdale (or 341 Radstock) shoes have been received.