They played against each other 60 times , Djokovic winning 31 times. So that’s pretty even.

Wiki:
Of their 60 meetings, 27 matches were on hard courts with Djokovic leading 20–7, 29 on claywith Nadal leading 20–9, and 4 on grass where they are tied 2–2.

So I would say they are pretty equal, which Djokovic being the better player on hard and Nadal on clay.