This is a hard choice, both are classics. I'm going with Snatch tho, Brad Pitt killed it too. He got the Irish gypsy accent down to a tee as well, which can't be easy. Funny as hell.
But man, all that weed they were growing on lock stock had me drooling back in the day. Like u wanna hang out in that room just for the smell of it.
Plank was funny too. Underrated character from Lock Stock. When the stoners were talking they were like "Don't let Plank fool you. He seems kinda silly but he's a f*cking lunatic!" or something along those lines.
Plank was funny to me cause I got a friend that reminds me of him. He don't really look like him but he has the same accent and speaks the same way