I've only had ruffed and spruce. Ruffed are the best eating wild game, spruce are inedible in my opinion, they eat spruce needles and taste like it.

Reminiscent of turpentine as one gal put it. They're a protected bird here but one occasionally falls during the heat of battle. I prefer eating grouse to all other birds.

I've eaten blue, sage, sharptail & greater prairie chicken. Of those 4, blue grouse are easily the best and it isn't close. Sage n sharp tail were easily the worst in fact challenging the worst duck I've tried. Greater chicken was ok.

Blue grouse are good enough that they rank up there with pheasant. Both are a step below quail (scaled or bobwhite).

For what its worth....

I have eaten about all of the N.A. grouse species at one time or another, and Ruffed are, in my opinion, about the best eating of the bunch. Blue/Sooty next, followed by Sharptails and then Ptarmigan. Spruce/Franklin's are near the same as Ptarmigan if shot early, but they can get stronger tasting later. Prairie Chickens are on the par with Sharptails in my book, and Sage Grouse last. Full disclosure.....the Sage Gr. I ate have only been from frozen whole specimens I took in to mount and fried up after being skinned months later. Also, I have never eaten either Rock or White-tailed ptarmigan.