I didn't care for comics on my 8" Galaxy tab 4, I had to keep scrolling left and right to read them, so I'd go with a bigger screen for the comics. I'd advise you to consider an Android of other full OS reader. I use
Moon+Reader Pro. Even the
Moon+Reader free version supports 40+ languages for the user interface, PDFs, comic books, epub, and more...
A full operating system device will also allow you access to more software to meet your changing needs. I'm glad I got my Galaxy Tab 4. I came from a Kindle K3.