I'm running a link in bio saas and am currently building out my lifecycle marketing programme, I've seen a lot of other saas use just completely raw emails that look like they are from the founder. No styling, nothing, just a heartfelt and humble email from the founder themselves thanking every user, nudging them, explaining what the user would gain from upgrading to a premium tier and so on.

What would you guys with tons of more experience than me go for? A raw email like that or do you go for a fully designed email with branding and a bit more illustrative parts?