Subjective for certain but many agree on a few basic things. But just like what makes a lady beautiful is debatable, so to is what makes a gun "perfect". But most seem to have a feel for what they like and many will struggle to explain it when asked. Hand size, arm lengthen, body size, body type, shooting style all need to be balance against what type of shooting is, what the gun weighs, what the balance point is, LOP, barrel length and about five extra things that seem to enter the decision. You sir, have opened a can of worms and I am happy to see the reasoned responses.