I don't really know what the differences are, so please explain them

I love clean and clear it works great!

I'd say Noxzema because it invirgorates my skin by opening all my pores

I prefer Garnier. My skin feels fresh & clean after I use it.

hmm. well ive never heard of Noxzema but Clearasil and Clean&Clear test their stuff on animals...i dont think it looks good on their skin making it all scabby and disgusting...plz, dont be self centered, animals have feeling too, its not like they cant feel something burning their eye out...go to the link below for companies that test on animals and companies that dont...
http://www.caringconsumer.com/resources_companies.asp

I dunno how to explain but i use none of the above. For Asian, use Olay products. But I've been using Neutrogena for years.