Two less good, one very good.
Some thoughts are like dinner party guests. You invite them into your sanctum, sit them down, feed them, converse with them. But eventually they’ve worn you out, you’ve had enough of them, and you want them to leave.
Others are like unexpected guests. They might pop in for a cup of tea, but they don’t outstay their welcome. They (hopefully) leave quickly, of their own accord, and you’re glad they popped by.
The first kind are thoughts that keep you awake. The second are thoughts that send you to sleep. The first are thoughts that break your zazen. The second are thoughts that do no harm.
So: fewer dinner parties, more quick cups of tea.