Favourite woody is T-Express, with Colossos as a pretty close second. T-Express has stronger airtime, better first drop and lots of headchoppers, but I loved the more open feeling that Colossos has.
Steel is more difficult to decide really. Personally, I love Steel Dragon 2000, though it's far from the "best" coaster. It's quite boring if you think about the layout, but it's so much fun. Other contenders for favourite steel would be Pyrenees, Fujiyama and Eagle's Fortress. I tend to change my mind a lot about which I prefer out of those four, especially after riding Fujiyama again recently. Love it!
Anyway, favourite coaster: T-Express.