Advice Needed what should i get iphone 12 or samsung note20?

It depends on what you have now. If you want to keep whatever apps you've got now and progress on games that you play on your current device then it's probably best to stick with whatever OS your current phone is running. It makes transferring your contacts and your information over to the new phone much easier if you just stick to the OS you have currently. I will say it's much easier to customize a Samsung device (or literally any phone that uses Android) than a iPhone. However you've got more security when it comes to an iPhone. Though I will say that Apple is notorious for making their consumers buy newer products and how they do this is by releasing new versions of iOS that don't function right on older iPhones.