For you OP? It won't matter, the results will be about the same.
You could do something like PHUL for strength and hypertrophy training or nSuns 5/3/1 5-day, both of which are upper/lower splits. I always run my U/L's at 6 to 7 daya per week.
Or you could do a PPL 5 or 6 days a week.
The question you asked was basically the same as asking if you should wear a black shirt or a white shirt to the gym.
A PPL split I design with 40 working sets will probably be superior to one that you find that only has 20, especially if you're capable of recovering from both. Not all PPL splits or U/L splits are created equally.
What's more important than what split you do is how frequently you train, how intensely you train, and how how seriously you support your lifting (diet/nutrition, sleep, recovery, etc.).
Good luck.