To be Honest I like the ability mummy much better, cohag can obv take a hit, like obv aqua jet switches and boom the opponent is useless, u can either wow from there or whatever it is you have in mind, also does worry seed work on grass Pokemon?
Even then atleast it can take on things like talon flame and mega Cham and even help against venu and pinsir.
Worry seed does seem better in the fact that it doesn't need to be hit. But I would rather give a useful move than waste a slot for it. And the only Pokemon in ou that can learn it are venu,breloom,smergle and ferro.