My opinion is not that of a super experienced chicken owner, but I love my buff orpington! I have a small mixed flock of 4 pullers, and the BO (Poppy) is full of personality! She's super friendly and curious. And she's a reliable layer.
I've read they can be "slow" and are often at the bottom of the pecking order, but that's not been my experience. And Poppy was a small, rather sickly little chick. Took some extra TLC to put her to rights, but she's def my family's favorite.
But I think @oceansunset73 is right. Depends on the rest of the flock.