either one that stood still long enough. all this talk about genetics... boring. what about diet? the spike might have better genetics, just a crappier food supply his first winter. if they're in the same geographical area and you can undoubtedly say they're siblings, then i'd shoot the spike, but you've got so much speculation, and isn't hunting supposed to be fun? why regulate the fun out of it for yourself? if you feel like shooting and you have unfilled tags, burn some powder.