Funny, cuz Di Resta seems to have bags more personality than Hulkenberg, but that could simply be the language shyness on the Hulk's part. I dont see that this would matter too much. Both drivers seem to be about equal overall and both have lots of potential and raw talent. I'd welcome either one to Ferrari, short or longer term.
I think it's 50% Felipe 40% Hulk 10% Schumi or someone else, at this point. Hulk will have lost some credit now after Di Resta's strong showing at Singapore - just like at Toro Rosso, the Force India drivers are cancelling each other's chance to look good. I can't see Di Resta to Ferrari, it's a total misfit of personality and Ferrari actually consider that as a factor. It's not like Hulk is a stereotypical cheap-talking, womanizer Italian neither but he's better than funeral-personified Paul. Even if Paul's probably just about slightly the better driver.
Who I really want to see in Ferrari(other than Vettel) is Grosjean one day. Wont happen with his current manager, but I think he's gonna be one of the newer talents that rises above the current crop.