I'd have to say Hearing.You can be visualy stimulated,read lips.Also a big difference if it is from birth or happens after you have already experienced years of both?I would need to see.I heard once....no pun ...that when you can not hear that you loose some sence of taste and smell as well Not sure if thats accurate.

I was at a red light the other day and saw a guy down the street walking along with one of those feeling poles used to assist blind people.everystep he took he had to stop and reach out with his hand ,clearly blind.He thought he was at the entrance of a Rite-aid drugstore (about 2o feet away)and instead was trying to walk into one of those steel fences that surrounds a trash dumpster.That shit was messed up,I drove up and trying to be respectful but not wanting to see this dude get run over or picked up by a trash removal truck I asked, "You need a hand bud" ?.....not missing a beat he say's "No thanks ,I have both of mine,besides it's a pretty day out"....??

That stopped me in my tracks!!Humor was intact ,dude obviously had "seen" something I had not.