I am a kobo user (libra 2). IMO you should get one with more ram (likely boox). My kobo side loaded with koreader software will sometimes crash reset due to out of memory errors especially with high res PDF/cbz graphic novels. Also Kobo lacks proper web browser what it has is super barebones webkit browser(sometimes reading text based webpages on eink is nice)
From what I understand boox is android based so theres less headache installing what you want.