For A4, buy 80g paper, any common brand will do.

Double; Hagami, Canon, HP, Jiayin, these brands of 80g printing paper are all very good.

HP only released paper last year. It is said that it reduces paper static electricity and so on, and the feeling is similar.

But paper can be divided into high white, bright white, and pure white. If you are doing ordinary printing, pure white is usually fine. If it is a drawing or the like, the higher the whiteness, the clearer the print will be.