personally I would say Ibiki, collected a lot of characters in my time thats always been my focus here and honestly ibiki is still in my top 3, there isnt a single ninja in the game he cant shut down hard.

True he has more requirements than kurenai to reach his full potential because to make full use of his control you need a way to stop your opponent recovering chakra (edo minato barrier/edo release madara/ mei swimsuit) and a mirror character in your team is ideal so both controls land on the enemy. But his chakra limit control + damage buff to controlled characters +super armor + decreasing def/res with standard + undodgeable/ chakra draining mystery, he is in my personal opinion one of the best event characters we've had.

To this day I always use ibiki in my ranked arena teams and frequently use him in 1vs1 pvp stuff, kurenai I recruited and barely ever use her, without a chakra limit to remove it her control is too flimsy, may be different since your cluster is much younger than my main, but I find it very rare to enter a match where the opponent doesnt have a single means of healing/debuff removal, all of which can very easily undo kurenais usefulness.

This will be different for you than I depending on the teams you face often, but all in all I would say kurenai is outclassed more often than not, there are so many people running immune heavy teams that her chaos passive is pointless in most cases and since every single heal skill in the game can remove her control it is much less reliable than that of ibiki.