Is maybelline rimmel or covergirl a better product?

They're both good. Each line has certain products that are better--I like Rimmel's mascara better than Maybelline's (and Max Factor 2000 Calorie better than anyone else's, but I'm old) and Rimmel doesn't even HAVE a loose powder, which you need (it's great for muting color, especially when you use a little too much of it) and Maybelline has.