Never had Sitka blacktails but by all accounts they are very good.
Unlike others, I do not much care for Columbian blacktails and they can get pretty rank with the rut approaching. Early season they are okay, but come november they are at the bottom of my list. At this point I don't bother hunting them any more.
I have eaten a lot more mule deer than whitetail, both are very good to me.
A good moose is even better, though I don't hunt them much any more. Way too much work after some fool shoots one and ruins a perfectly good hunting trip!