"Mainly because there are/were many more Spitfires available for films on the subject,"
I think it pre-dates that - even during the war "Spitfire" was an iconic name whereas "Hurricane" seems to have been mentioned in passing. And then of course there were the films about Mitchel etc
My copy of "Britain's Wonderful Air Force" - published in 1942 - states "The Supermarine Spitfire... is almost certainly the world's finest single-seater fighter"