UI. Atlases or individual pictures? Help please.

Hello. A question that I can not solve on my own. I create an interface using the atlas where I have all the icons. The atlas size is still 1024x1024, it takes up 1 megabyte space, and each sprite from it is about 30 kilobytes … And if I upload each picture separately 64x64, then it takes about 15 kilobytes, which seems to be less resource intensive? But everywhere they say that atlases are cheaper … I’m confused. Because I will have a lot of things in the inventory in the game, with which I also make icons, I would like to do it right. Since I suffer with sprites.

With the atlas, access to the file for loading is only one.