Meth and crack are both cheaper than coke, which results in class/socioeconomic effects in who uses them as well as how they're portrayed in media and handled by government.
An other difference is that snorting coke leads to a somewhat delayed, milder and much longer euphoric effect. Injection and smoking lead to much faster, more intense and shorter highs. So the differences in methods of consumption would lead to very different patterns of behaviour as well e.g. it's less likely that you can do things on a crack high than after snorting coke, and the intensity of the high would lead to increased odds of chasing the high.
Plus the duration of the high means that you'd necessarily have to spend more time (relatively) chasing that high or ways to achieve it.
Plus the duration of the high means that you'd necessarily have to spend more time (relatively) chasing that high or ways to achieve it.