I use an Android Tablet (Samsung Galaxy Tab S5e). Most of my reading is through the Libby app and Google Play Books.
An Android tablet is overall a more versatile device. I can also use it to browse the web and watch Netflix (especially while traveling). The downside is it's on the larger side (10 inch). Would love to get a smaller 7 or 8 inch tablet, but the specs for those are usually really low end. Like not even a 1080p screen.