The vast majority of hybrids and MtBs that use these link wires (and it's a LOT of bikes) have the shorter link wire on the rear brake. Usually due to the reduced distance from the casing hanger to the canti arms when compared to the front. If the brake pads have the smooth shaft mounting their placement WRT the canti arms also affect the leverage range possible as the canti arms rotate outwards with the pads being clamped further out on their smooth post/shafts.

To add specificness to maddog34's reply- For a skilled rider having the greater leveraged set up on the front is great. Certainly, the front brake is the one that will save your life if you're unlucky, or ruin your face if you're not skilled and go end over. However the bike industry is very liability aware and, actually, front brake "power" is often purposely reduced with lower leverage set ups or spring loaded cable noodles (for linear brakes) often seen of the more recreationally oriented bikes.

So the question as to which brake (front or rear) "should have" the greater leverage is opinion. Luckily the OP lives in the good old USA where one can do what they want (to some degree) Andy