I think that the differences are enough to make them very complimentary. The enamel dial does make a big difference to how the two watches appear on the wrist. I must check, but I am not sure if this is the only black enamel by Patek ever??? It creates a very distinct feel. But the 5070P, thanks to the size and nature of its case, offers a completely different approach to the chronograph feel.
I think it is hard to rank these two together....better to use as compliment. Both have a very distinct (but different) appeal.