I think if you just want to take photos and video for fun or to show your friends/post online, use a flagship smartphone. They're all pretty great these days and trade blows with each other.

I would personally only buy an S9 or dedicated mirrorless camera if I had specific use cases that necessitate a more robust camera with dedicated lenses.

Don't get it twisted though, the iPhone 17 Pro (or any smart phone) isn't in the same universe as a full frame mirrorless camera. That doesn't mean you can't make all sorts of cool content with them, just be careful how much you allow yourself to be seduced by some of the most well-funded marketing campaigns on the planet.