I ran both of these tires on my 2011 JKU.
Falken = heavy as h###, Hankook = lightweight to average
Falken = miserable wet traction, Hankook = like driving Velcro tires on a cotton highway
Falken = don't even look at wet grass or mud or you'll be stuck before you pull onto it, Hankook = respectable for an AT tire. Not a mud tire, but holds it's own.
Falken = silent on the road, Hankook = noisy
Falken = squirmy tread which tracked all over the lane. Required two hands on the wheel at times even when dry, Hankook = no such issues
Falken = thickest sidewalls I've ever seen, Hankook = average sidewall strength
Falken = picks up rocks like they're magnetic, then throws them all over your paint, rockers, and mirrors Hankook = didn't have that problem
I will point out that Falken has come out with an AT2 tire now which supposedly has improved the tread compound to solve some of these issues.
~Lots of modded Jeeps and a Toyota 4Runner~
My favorite quote from the press release.. sad but true: "Chrysler claims its products, especially the Jeeps, can handle all sorts of terrible conditions, churning through muddy swamps, climbing mountains, and crossing rivers. Turns out they cannot even handle a car wash."