What's the difference between the two? I've seen both in the same book. For example in the Bone Clocks by David Mitchell:
He’s clever, I realize. First he makes you grateful. Right. Of course. I do believe it’s time I was off.
DANDELIONS AND THISTLES grow along the cracked track and the hedges are taller than me.
And look what a fool she made of me, when my turn came to be Amanda Kidd–ed. Doesn’t Stella need friends? Or for Stella, are friends just a way to get what you want?
ON MY LEFT’S a steep embankment, with a dual carriageway running along the top, and on my right a field’s been cleared for a massive housing estate by the look of it.
“What’s that s’posed to bloody mean?” Brubeck lets it drop. So I let it drop too.
• • •
THE CHURCH IS quiet as the grave. Brubeck’s asleep in a nest of dusty cushions.
“Not calling me ‘sweetheart’ would be a good start.” I don’t hide my laugh. The guy stares daggers at me.
• • •
LESS THAN A hundred yards later this knackered Ford Escort van pulls over. It might’ve been orange once, or perhaps that’s just rust.
• • • a bigger scene break than then spaced one? When to use the former and when to use the later?