why do I like sheng? Because it's just so good
There are many regions, each with its own character - plenty of space to choose what suits you. Also, the tea changes in time, which adds different dimension to taste. Actually, the aging thing is good from a storage point of view - if you don't finish green tea in a year, the rest won't be much good. With puerh, it's no problem, you're not pushed to drink it.
There is a problem with sheng, the problem is, that relatively a lot of it is no good. On the other hand, there is a lot of cakes with character, that are very interesting.