All things be equal I don't think you can go wrong with either.
I agree with JC, and also with bigvan ...
Which one do YOU like better? Which feels better in your hand? Based on reputation alone, I'd say they're both good, serviceable pipes. But you're the one who has to smoke it. Get the one YOU like the best. Then save up your pennies and go buy the other one later.
I have 2 Nordings and 3 Petersons. I like them both. Both brands make a wide variety of different quality levels of pipes. In some respects, I like Peterson's better and in other respects, I like Nordings better.
At this point, my decision between the two would be how it looks, how it feels in the hand, and mouth, and what the interior of the bowl looks like, as far as coating / no coating, and how accurate the hole is drilled at the bottom.
I would also check the symmetry of the bowl, shank and stem - that they all line up.
You'd be surprised how many do not form a straight line.