soma gives a nasty haangover and nasty gut feeling to me like some cheap booze. diazepam makes me feel great, but it goes to your head - one week of valium and I'm dumb and forgetful for a month. moreso
This is really too subjective a topic, different drugs work better for different people it's not as simple as which is best. Also, "what is the best drug" type threads are not allowed according to OD forum guidelines.