the comics characterization
the movie characterization
But I think they both lend themselves to interpretation. Movie Tony's eccentricity is tempered by his heroism and humanity, and that's the crux of Tony (besides his genius). Is that despite what everyone else thinks, he still goes about his business because it's the right thing to do. Also ... I think the eccentricity and quirkiness of the movie Tony works much better in its form, however, in print it wouldn't be quite as effective.
You are an apocalypse dreaming of butterflies
we are a patchwork of miracles.
I voted for the comic version anticipating that more people will go for movie, but honestly I think the movie version is a good take on the newly minted Iron Man i.e it's a good take on early comics Tony put him through one tenth of the stuff comics Tony went through and you'll start to see brooding etc.
So my answer is that they're the both Tony, and I like them both sorry for the non-answer.