Blackwater or Purple Chem

Which would you choose and why?
If you have grown either, what did you think of it? I'm lookin for potency only, yield and grow time aren't important, but a plus.

I would choose purple Chem.. I grew bubba loved it(still running) an I grew deadhead(chem91 skunk va x sfv og male) loved it so them two together is only nothing but dank.. I missed my chance at getting them but I do plan on scoring some down the line..

As far as blackwater goes I've heard mixed reviews but it does put out some pretty buds.. But not as potent as the other og's Again I didn't grow it just go by what I've heard.

Purple Chem - reason: Potency.