This is a very niche difference. In general once you send something "to the public" you can't expect that it stays private. So if you need to keep items on your

This is a very niche difference. In general once you send something "to the public" you can't expect that it stays private. So if you need to keep items on your feed for a few weeks after publishing it will have a near-zero difference to the availability of that piece and be picked up by almost all subscribers.