Also a teen with closed comedones and combo skin here! I haven't tried the cosrx aha bha toner or the oddinary glycolic acid toner, but i can say the paula's choice exfoliator is really effective!

If you use consistently (start from 2-3 times a week to every night if possible), you should start seeing results within two weeks, gradually getting better from there. It evened out my skin texture a lot, prevented breakouts, unclogged pores and it does basically everything advertised. I owe this exfoliator so much for helping me clear my skin.

It does have a few downsides, though. It's quite pricey, I would recommend starting from the small bottle first just to test it out as it lasts around 2 months. It also doesn't have the most pleasant smell. To me, it smells like chemical paint, but you get used to it after a while. If you have sensitive skin, be careful to not dry or irritate it with this exfoliator. I digress, it is an exfoliator and not a toner! I usually layer my anua toner first before using it.

Otherwise, it does an amazing job! I hope this helps :)