It used to be my 68" Stewart Slammer 3pc. I probably could still shoot that better than anything, but I let it go because I have found shorter bows to simply be more practical in the swamps and woods.
Currently, and for many years to come no doubt, it's my Java Man Elkheart...oh but you gotta have a 'back up' LOL, that would be my 58" Slammer Special. Followed by my Lil Slammer 56", my Fox Triple Crown, OH, AND the latest edition, my Silvertip Carbon! LOL. But really none of them are back ups. I practice with all of them and when I go hunting I will grab what fits the mood and either the night before or morning before a hunt will sling a few arrows to realign the brain. I agree with Keith, if I can't shoot them all pretty well there's no point in having more than one.