There's still pure cocaine around, you just have to know the right people.
The two highs are way different. Both are addictive stimulants, sure, but...
Cocaine is a monoamine reuptake inhibitor, Meth is a monoamine releaser
Cocaine is very short lasting and easily metabolized/deactivated, Meth is long lasting and metabolically persistent
Cocaine is a natural product, Methamphetamine is a synthetic drug.
Cocaine breaks down in moisture, Meth does not.
Cocaine is an anesthetic, Meth is not.
Cocaine has a solid freebase and is sold as both HCl salt or freebase, Meth has a liquid oil freebase and is almost always sold as the HCl salt.
Some people prefer cocaine, some people prefer meth, some like both.