I was looking for this. The Departed is much better than Infernal Affairs, in my opinion. The HK original has too many characters and also is wishy-washy in how the mole inside the PD is, by default, an evil bad guy.

The William Monahan screenplay is much more efficient and does not pull punches. Matt Damon is a scumbag, full stop.

I feel like the Departed fixed each and every flaw I found with Infernal Affairs.