We all know that Nadal's strength is clay and there are years wherein he was really unbeatable on clay court. So I think he is still the man to beat in French Open. However, we have seen Djokovic emerges and young prospects coming out of the shadows although they really choke on big tournaments, I wouldn't be surprise for another Nadal vs Djokovic finals in Roland Garros 2019.
If this happens and Nadal is again on his A game I will try to watch the final in RG. Tickets aren't cheap but it's definitely worth it.
RG is a great experience especially if you are blessed to see Rafa Nadal's game. Some year ago I was lucky to be in France and I went to the court to see a game that Nadal was playing. It was one of the best pieces of experience I have in my entire life.
I haven't seen any live tennis in my whole life, lol. I envy you for having the chance to travel and watch tennis greats like Rafael Nadal.
The closest I can think of is watching Davis Cup eliminators in my country, but it's nothing compare to watching at least one grand slam tournaments in my lifetime.