I have krita downloaded, it has a lot of really great brushes, especially the textured ones but they're not customizable as far as ik, it doesn't automatically save things, but you can animate on it and do fun things, the app is just hard to learn how to use in general though imo
magma is super easy to use and you can interact in art jams and stuff so that's fun but i dont love the brushes that much and it doesnt have as many features as krita does, but the liquify tool is much better, though its a bitch about storage
honestly it just depends on what you wanna draw atm, but they're both free so