These are by far my two favorite brands. I can share a bit my thoughts if you will allow me. I own two of each: a Lange 1 TZ in platinum and the Triple Split and a Patek 5270p (salmon dial) and a Nautilus 5990. Each of these pieces have very, very different characters. When it came to choosing a PC chrono, though, I gave a slight edge to the 5270. I think it is slightly more elegant. The case design of the Langes are simply amazing on a pure chrono (Dato, Double or Triple Split) or, say, a Zeitwerk, but feels a bit too industrial for the elegance of the perpetual calendar.
In any case, the Dato perpetual is a lovely watch and you can’t go wrong with it I think. There is a very good comparison on YouTube done by Watchfinder that I recommend: https://youtu.be/LeWON9fL6iM. Very detailed and interesting. Best of luck!