Should pillar content be pages or posts?

Hello,

I see many websites having pillar content that doesn’t have a date showing. I was wondering if they do that to rank in search engines for a longer period of time? It confuses me because I have read elsewhere that it is bad to not show dates.

Do you think it is better to use pages or posts within wordpress to write pillar content? The reason I ask is because of this date idea.

My initial thought was to use a page. However I also realised that I could just recreate the post every year (if relevant) and then redirect the old post to the new one. That way I get to keep the evergreen sections whilst updating other big parts of the pillar content and having the date reflect that.

Hope that all makes sense,
Adam