Coke is more euphoric and cleaner, you can do a few lines at 7pm and be in bed with a mug of hot tea by midnight. Crystal is dirty, it's too strong, lasts too long (the three reasons why I used to love it) and others that have been around users or used themselves know what to look for so its obvious when someone is on it and I hate to say it but it is disgusting. I was a heavy meth user for years (3 years clean) and it turned me into a shell of a human being, physically, mentally and emotionally. Sure the first few hours are amazing but not worth the 24 after that or the week that follows. Coke is more dangerous as it can easily cause heart attacks and strokes with an OD in healthy people, meth not so much.
When I was using meth heavily, coke(sniffed) would have no effect on me. Well it would barely make me high for maybe five minutes, a slight stimulating effect, and I know it was good coke because the people I was around would party on it all night. So that much I know - a meth tolerance will make cocaine not work anymore.