Comparing a startup offer with equity against a boring stable offer with more base and honestly still don't have a clean answer

Startup offer has real upside on paper and a mission I actually care about, stable offer just pays more right now with none of the theoretical math. Talked to a few people further along than me and got completely different advice depending on who I asked. Ended up making a spreadsheet just to see the numbers side by side, which didn't make the decision easier but at least made it visible.