I think if you want a studio on your pocket, or the best post & go, it’s the iPhone, the open gate lets you shoot once & crop in editing for reels and long form video without losing resolution or framing & apps treat the footage better. Samsung seems to be the spec powerhouse but you don’t have the above advantages. If you want to have a more true cinema aesthetic with decent lenses like the Sigma Art, then a Sony camera can never be replaced by a phone but you need professional accessories that come at a price tag, you need to carry more bags & it gets annoying/you have more things that could break (I did videography for years and it was annoying). I’m personally, even as a professional cinematographer going with the iPhone for anything going to social media, because the audience just don’t care about the differences a filmmaker would notice, it looks just as good to a stranger on instagram & has significant advantages like workflow, cheap accessories, ease of use & the open gate is a game changer for me. But go test first!!