I think PPA is far better than ECA, but that's only from my experience. ECA stacks never helped me much.....but, yohimbine (which is in PPA stacks) gets my body temp. to like 99-100 degrees! Also, the norephedine (while not thermogenic in humans) does a hell of a job supressing appetite.....
I'd go with Adipokinetix or MD6 (which are pretty much the same as PPA) and are a lot cheaper at 20-30 bucks....