Do you have a problem with time or task management? Do you know a student or colleague that does? Do you have GSuite for education? If you answered yes to either of the first two questions and yes to the third question as well, then you are in luck, because you can actually solve the problem with GSuite. Google Keep is a rather new product from Google and I like to think of it as an Evernote-lite. Tasks exist in your Gmail account and you probably never notice them at all. Either one of these products can help your organize your time and tasks better.
This presentation walks through the basic features of each product and also makes a comparison of the two. The basic choice comes down to what you want to be able to do with your task list. Do you want to share it with others you are collaborating with? Then Keep is best option. Do you want to use it on your own (and possibly sent a list to someone)? Then Task is part of your Gmail account already, so why use another tab?