Ill go for HEAT. I think Deniro and Pacino were great in this movie and when they meet for coffee was a classic movie moment and the honor between them was simply brilliant. I liked Collateral but didnt care too much for it after seeing it a couple of times, Heat ive seen countless times. While Heat is kinda long u dont really care because u r soo into the movie that u dont realize how much time has gone by, at least in my case.