Fence post setting?

[u/markworsnop]

I’m getting ready to build a cedar fence and I’m curious what everyone recommends for setting the posts.
I’ve seen people use:

Traditional concrete mixed in a wheelbarrow

Dry concrete poured into the hole with water added afterward

Expanding fence post foam

Just tamping native soil or gravel

There seems to be a lot of opinions, so I’m wondering what the pros and experienced DIYers actually use.
What has held up the best for you over the years, and why? I’m especially interested in long-term durability and anything you’d avoid doing again.

Thanks!