That's an easy choice for me -
Edward Mannock, and that's for a lot of reasons, least of which is his high victory tally.
Mannock had a very tough upbringing, and he could easily succumbed to it, but he overcame a number of difficulties early in life threw at him - including being abandoned by his father and living in abject poverty - to eventually end up with quite a decent job prior to the Great War breaking out. That job however, got him interred in a Turkish prison when the war broke out, and he was so badly treated by the guards in that prison (because he was always giving the prison guards a hard time) that he was eventually repatriated to the UK under the assumption that he would not be fit for any kind of military service, but again he overcame the ill health caused by that maltreatment to eventually end up as a flyer, this despite having less than perfect eyesight too, not to mention him not having the usual social credentials necessary to get into flying training in the RFC, especially since he was also quite an ardent socialist, and he was apparently not afraid to voice his opinions either.
When he got to fly, he was considerably older than the average pilot too, and not only that, he was accused of cowardice when he first started war flying, that also being right at the worst possible time to start too - 'Bloody April'. Despite all those difficulties, he became what many regard as the best flight leader in the RFC, and given the vagaries of claims, confirmations and victories, it is quite conceivable that he could be the highest scoring pilot of the war.
For someone to start off with so many disadvantages and to overcome them all, because he was determined to fight for a cause he truly believed in, is undoubtedly inspirational, and unlike many who simply joined the military under a wave of thoughtless patriotism, for Mannock, the fight had true meaning which tallied with his social beliefs.
For me, he is a truly inspirational character, and had he not been hit by ground fire and killed, one can only wonder what else he would have gone on to achieve had he survived the war - given that he was hugely interested in social justice and politics, I wouldn't have put it past him to end up as the Prime Minister had he survived. And I bet he'd have been bloody good at that too.
Ira Jones' biography of Mannock does take some liberties with the facts, but it is basically a true tale, and it speaks volumes about Mannock that a man who was himself quite an accomplished fighter pilot would feel compelled to put down in writing the tale of a man with whom he served and so admired.
I'm not really into having personal heroes, but I make an exception to that with regard to Edward Mannock. If there was anyone I really wished I could meet and have a conversation with, it would be him.
Al