it's essentially overall concept/build/fit/finish.
it doesn't go by who/what ever the judges want to win.
(if it went by favoritism or bias,it wouldn't be a contest then would it?
)
to sum it up the easiest,wow factor and "best of the best"
.
bring your "A" game.
like the giant g1 prime cannon this year.....it literally blew everyone out of the water.