Well I've used both, separately and at the same time actually. Coke withdrawal was always the tip of the iceberg for me so to speak. MDMA was also very depressing and I honestly wonder if I've done long term damage from abusing it to my serotonin receptors, but in the end of the day it was most likely the easier of the two evils to survive on. Coke made me crazy, psychotic, even black out. It also nearly caused me to have a heart attack and I would have died had I of not swallowed a handful of tranquilizers. I think that's why I have a personal grudge against the stuff, but still, take care with ether.
Oh- smoke, don't get me started on tweaking. I WAS the guy from crank. My heart pounded, my senses were intensified to the point where I could hear things a long distance away, my vision was clearer and more focused and I had mounds and heaps of energy that wouldn't go away. I fucking loved it. I was ontop of the world, and everyone and thing was my bitch. I was god himself. See, cocaine does the same. But not as intense, I agree, but it's also fucking horrific. With speed I stopped dosing. With cocaine I never did, I'd freak out when it run out and is ask everyone and anyone to hook me up with some. Boy I mad some stupid decisions while on come.