Marketing Question

I just started my audience and campaigns, and wondering should all my new campaigns (these are just basic newsletters, some with a CTA) go in an automation sequence so that every new subscriber receives all my newsletters OR should I make the newsletters stand alone and just push out to all subscribers simultaneously when they’re published, so that I can promote my newsletter on Social (ie “this week’s topic is ______, did you get it?! If not sign up now!” If I put them all in an automation, then if I write a newsletter on, say, blood pressure, someone who joins my audience in 3 months will get it in a sequence, not on the publish date. Thoughts? Thanks!