tone wise, it'd have to be the od-3...i tried an od-1 and no matter how much mojo it has, i still feel the od-3 wins this category...
sd-2 is a pretty good pedal too, especially the lead mode, it's the smoothest gainiest drive i've ever come across....as for the crunch mode, i used it for a year onstage, couldn't really cut thru the mix...so i didn't find much use for it...
sd-1 keeley mod...used together with a compressor (with the clips i heard) PERFECT COMBINATION.