I've got a Vive, its good if you have space to set up a more dedicated play area, I've only rarely used it sitting, but seemed to do well in those. Its made for more room size use, my computer is pretty mid range and can run it no problems. While I have the Vive 1 and I don't feel any need to upgrade to the Vive Pro, if I was just starting off and money isn't really an issue I'd go for the Pro just for the updated features and built in headphones.
Never used the Oculus so I can't give an opinion on it.