I'll bet you can't tell me what it smells like in the Sistine Chapel. You've never actually stood there and looked up at that beautiful ceiling; seen that.
I've been to the Sistine Chapel, and yes it has a lovely ceiling, but it's also jammed full of other tourists who are also craning their necks and not looking where they're going.
The same goes for the Mona Lisa, which is the least interesting painting in the Louvre. Either see it in a crowded room full of tourists, behind a glass case, or see every last brushstroke at https://en.wikipedia.org/wiki/Mona_Lisa (7k x 11k pixels in uniform lighting)
Personally I liked seeing the brickwork of St. Peter's dome more, but each to their own.
While the Vatican has a lot more loot and bling to look at, I'd say looking at the pictures on https://en.wikipedia.org/wiki/Gallery_of_the_Sistine_Chapel_... is the superior experience.
The same goes for the Mona Lisa, which is the least interesting painting in the Louvre. Either see it in a crowded room full of tourists, behind a glass case, or see every last brushstroke at https://en.wikipedia.org/wiki/Mona_Lisa (7k x 11k pixels in uniform lighting)
Personally I liked seeing the brickwork of St. Peter's dome more, but each to their own.