Every year it gets harder to beat the quads. They get faster every year as technology improves while I get older and my bones get more brittle. 
Putting the quad into a corner is a lot easier. When I ran dirt track on mine we would pitch it sideways before we even got to the turn, hold it wide open and hang on through the turn. Try that on a trike and you'll end up on your head.
1985 Eddie Sanders ATC330r
1986 Monstecate
1984 ATC70 (awaiting 125cc transplant)
1984 ATC125M
1986 GSXR 750 - Keepin' it old school!
1999 Arctic Cat 500 4x4 plow machine
1999 Arctic Cat Thundercat 1000 (lake lizard)
1996 Arctic Cat Jag 440 L/C (ditch banger)