Opening a book

Which do you prefer as an opening line?
‘Once, during a summer we spent at Kerneham, Francis locked himself in the church for the whole of a night.’
Or:
“It is when I look at my hands that I believe I am an old man.”

Both sentences come from Susan Hill’s The Bird of Night. She opens with the first sentence. The second one comes in paragraph five.
For my money, that second choice is much the better opening.
In working with writers, I often find their best opening line is buried further into the text. I picked up The Bird of Night last night. It has gripped me now. The writing is taut and fine. But the book takes two or three pages to really firm up on its voice.
You’ve got to start somewhere. By the time you’ve finished a book, though, you’re in much better shape for writing its opening.