Without a doubt my favorite strain right now for roughly two years has been sour diesel. Best tasting of all time in my opinion, it's a fantastic up high where you can function and socialize, while still effectively treating my symptoms. There are a lot of fakes out there, that aren't the real sour diesel, mixtures or wannabe copycats. People cross other strains with sour diesel to get a faster producing and higher yield plant, but it's not worth it, although the crosses are good, it's better to pay more and get the pure strain.