I would never include an advertising clause -- I think that's a very onerous term. The projects I work on that use BSD-style licensing do not have an advertising clause.
Yes, I'm talking about clause 2 of the original "4-clause" BSD license. Advertising is clause 3 of the original BSD license. The newer "modified"/"3-clause" license deletes the original clause 3, but clause 2 remains unchanged.
I would never include an advertising clause -- I think that's a very onerous term. The projects I work on that use BSD-style licensing do not have an advertising clause.