I brewed my same Brown Ale recipe with White Labs' English, British, and Burton Ale yeast strains earlier this year. For something like a Moose Drool clone, I'd probably stick with English Ale, as it's the most neutral of the 3 I tried, leaving plenty of room for the malt to come through. (It's also a bulletproof yeast that never fails to take off for me.) The other 2 gave off a lot of esters and a bit of diacetyl, which is expected for a northern brown recipe like I was brewing, but I've never really noticed in Moose Drool, which seems to be more an american style brown vs. an english. They did add a nice complexity the English strain lacked though.
If I had to rank the 3 by my favorite, I'd go Burton, English, and then British Ale. Haven't had a chance to try Wyeast's yorkshire yet, so I can't comment there.