Poison touch would probably be better.
It makes your contact moves have a 30% of poisoning the opponent which cripples them a bit.
While not being as good as being badly poisoned, as Terlor said, I would still prefer that over Stench because I feel that wasting a moveslot on Muk for Toxic isn't worth it.
Might as well put Toxic on something else.
Just my opinion
Hope I helped.