Some questions about iPhone 12

I currently have a galaxy S9 and I’m planning to upgrade to the iPhone 12. I’ve only ever had one iPhone and it was the 3gs. I want to move to iOS as I’ve had enough of Samsung giving the UK an inferior processor. Will the move to iOS be difficult?

Should I bother getting other apple products, the Apple Watch SE has intrigued me, and maybe a mac book too. The apple ecosystem looks very good, however I don’t want to trap myself. https://100001.onl/

Also, should I get the 12 Pro or just the 12? I want the pro just for the extra ram and better camera setup. Is that worth it