Hmm....best flicks? Some of his best stuff was probably back in the late 80s and early 90s, right when he was hitting his stride in Hong Kong. Stuff like Miracles, Supercop, Drunken Master II, Wheels on Meals and Police Story. He's lately been returning to his old stuff, too. Which makes me happy. First New Police Story, the Myth now this. It makes me warm inside. And if that project with Jet Li ever materializes, I'm sure that'll blow my mind, too.
And actually Pug, I think it was the other way around. It was more like Jackie Chan had the idea for an East meets West story that he was gonna call "Lion Goes West." But Sammo Hung used that idea for Once Upon A Time In China & America, for which the real title was "Lion Goes West." The two had a thing over that for a little while, but they reconciled later. With Hung cameoing in a couple of Chan's films since then.