Personally, I use head&shoulders, have been for years.
I switched to other shampoos at times, mainly out of curiosity, and because they were a lot cheaper than H&S, but I was very disappointed because I have a lot of problems with dandruff. Every single shampoo I have tried (Palmolive, Garnier, you name it! The big brands!) turned out to smell nice but that's it. I was still having dandruff problems. With H&S though, problem solved!