In Settings-->Permalinks is there any difference between:
checking Custom Structure and using:
Are they both correct? Will they both work?
/%postname%/ is the correct one and if you are asking be cause it says post_name in the codex then its just to show that you will get the actual post name.
I just read a really good and informative article suggesting you should never use
/%postname%/ I've used that since the beginning for SEO reasons. I've heard arguments throughout the years suggesting this was a bad idea. After reading the article I'm linking to I immediately switched all sites I'm associated with to
The article suggests that using the old way can cause a large increase DB queries.
There are some pretty respected names in this discussion, all are in agreement. It sounds like it might be resolved with V 3.3, but I've decided not to take a chance. Here is the link: Digging Into WordPress Article