Coke, even if very pure, most of the high or a good amount is spent thinking about more and unless you have an unlimited supply, its pretty shitty. Plus coke wil llead you to make horrible decisions (IME)
Crack - same thing as coke but worse
Xanax - The buzz can be great, but the stupid shit you do on high doses is amazing. I have been so trashed I cooked whole meals I forgot about, unknowingly spilled salsa on my dogs head that dried and it matted there, almost got a dui (wreckless driving was issued instead), called my uncle and started a huge fight with him (I really was pissed at him, and I DONT feel bad for what i said, but I feel bad for stirring up shti in my family and upsetting the sensitive side of my family), I have also stolen stuff (usually big chains) and half the time its stuff I don't even need, I just get compulsions on it + you feel like your sooo slick and you will lNEVER get caught. Finally, the withdrawl can cause seizure and fucking death so unlike opiates... when your guy is out, you finish your script early, or you are out of money you just have the shits, stomach aches, and basically hardcare flue w/ depression tossed in..... but no worries of actual DEATH. After writing all that, I still take the stuff occasionally... (A LOT of it recently to quit cigarettes and it actually worked) but now I am going every other day and not exceeding 3 mgs.