I've used both of those quite a bit....I've owned 3 of the power crystals, I gave one away to a friend in need of a call, the crystal surface separated from the pot on the second one, and I later purchased the third, which I still own. The power crystal sounds good but I don't take mine to the woods much anymore because I have better glass and crystal pots that I rely on.
I've only owned 1 super aluminator....it's bomb-proof and sounds good....I still use it quite a bit because it's dependable in wet weather and is very tough.
Based on my experiences I'd recommend the aluminator....