I havent quite moved into the digital realm for comics yet but right now it appears like Comixology is the way to go for general interest stuff (with the unfortunate side effect of supporting Amazon), but like GoldenJoel said I think theres ways you could get more specific with Marvel and DC.
I briefly did some research on the Shonen Jump stuff while looking into getting a sub for a little cousin. There are two apps: one for Viz, the publisher, and one for SJ, the publication. Im not exactly sure how those two intersect, if at all. Regardless, Ive heard that both those apps are good and worth it if you want to keep up with current manga and it might be worth downloading both and seeing what the subscription options are there, and if the two intersect. It would be nice to have access to Ino Asano’s new stuff as well as, like, Boruto, for sure.