I live in a country where pot is rare and hash is easy to get.
And i would say the best way to tell how good your hash is, is to burn it and smell.
I would also say that the darker its is, the more stoney high you will get. There is also a light greenish hash going around and i would say this gets me more high than stoned. But yeah, smell it, touch it and feel how sticky and dark it is, and dont forget the best method to find out how good it is; Smoke it