ALWAYS amphetamines over coke. Coke is SOOOOO overpriced and lasts for such a short time it just isn't worth it. If someone offers me some, I'd never turn it down, but like meth lasts up to 3 days and coke lasts up to 20 minutes.
I prefer amphetamine sulphate, personally.
If you bored and desperate, then that's your issue but meth should be retired and that's my opinion.