Mammoth is still the king, but it is too shy and large for most backyarders. you really need to hand pollinate, preferrably with pollen from an AP or such. This is why we've been making selections from sports of the Mammoth - hilary whites pink mammoth was the next upgrade in croping, which got close to an AP in production while keeping about 4/5ths of the original size, and Paxtons Prolific is the next improvement via sport of hillary whites, which crops too heavily and will size up to roughly the same as the hillary whites if you thin them out enough.