which one

It really depends on your hair's texture and condition, as well as the line you're using. I absolutely LOVE Frizz Ease Glistening Creme, which is cheap and only found in the likes of Target and Walgreens. However, I'm also fond of Redken All Soft, which is salon fare. Regardless whether you're buying from the salon or storefront, there are some ingredients to watch out for, including TEA-lauryl sulfate and sodium lauryl sulfate, among others which can cause dryness and scalp irritation with repeated use. SLS is more common in drugstore brands but I've seen it crop up in salon brands (Biolage!) as well. Regardless which line you're shopping, it's just a good idea to be an educated consumer and to take all the marketing claims on the front of the bottle with a grain of salt. Legally, cosmetic manufacturers can say virtually anything they want about their products because these words are unregulated by the FDA. However, the ingredient list IS regulated, and therefore is the only reliable source of information on haircare packaging. If you understand this part, you've hit a home run.

So essentially, you can find decent options in the drugstore if you know what to look out for, and the salon offers great choices as well.