Heat is a million times better than The Irishman
Robert De Niro and Al Pacino were perfectly casted in Heat, it's too bad I can't say the same thing about their roles in The Irishman.
Michael Mann used the right two actors for the leading roles in Heat. Martin Scorsese used the wrong two actors for the leading roles in The Irishman.
Heat is way better, it's a masterpiece, it's excellent every time I watch it. The Irishman is a not even close to being a masterpiece, the more I watch it, the worse it gets.
Though, I will say Joe Pesci's supporting role as Russell Bufalino in The Irishman was perfectly casted. I'll give Scorsese top marks for that decision.