-128GB is sufficient only if you don’t download too many games in your phone and not too many images and videos in phone. 6GB should be the minimum in Android phone, 2-4GB is slow sometimes when loading something in phone, based on my experience.

-Well, for saving storage, it depends on what kind of apps that you have downloaded.

-My phone is 256GB, but I don’t use it too much, now it’s used around 150GB over 256GB. I am using 256GB just in case that I need to take many pictures and videos with the phone.