Moose is popular with folks who have tried it... It is quite a mild tasting venison..Very good, actually but I prefer the fuller flavored game meats like caribou and elk...
Like Western Ma Hunter said, the rutting bulls tend to be stronger and not as good, but that can be said for most any game species... I've had rutted up whitetails and mulies and elk that were pretty gamey, and I've never tried rutting caribou, but have heard it is so strong as to be inedible...