as far as I've experienced, only ritalin and it's analogues are the only drugs in the stimulant class that have helped PTSD symptoms in any useful manner. They simply help me focus on rational feelings when everything starts to go irrational.
meth is far too wild, powerful, and long-lasting; other amphetamines are likewise to blunt a tool for PTSD.
cocaine is completely contraindicated for PTSD.
ecstasy can be theraputic, but only in a safe, controlled environment, and only when used sparingly.
All are highly addictive, and its playing with fire especially with PTSD.