Both can be really euphoric, as well as the tolerance to the euphoria goes up rapidly. GHB for me had a euphoria unlike any other, very clean and clear, all inhibitions gone. Methylone the first few times (i abused it while it was available) was also a very clean feeling. However GHB takes the cake as it has no aftereffects when used responsibly (less than once a week on a long time basis). Make it a rule not to redose with the GHB and not to do it more than one "session" a week. I started doing it every other day.. every day.. until i saw what was happening and dumped it before I got bad withdrawals