For Android, the ReadEra app, because it's the only darn ebook app I could find that allows a scrolling mode instead of page flip. And you can add the Twilight app also to change screen temp, and extra dim mode in the dark. It works really well.

For e-ink ereaders, I don't know what the best one is right now. Definitely not Kindle though. And Kobo has overdrive library integration. But e-ink in general is very nice for reading. Definitely go for 8 inches or more in screen size though if you want to read manga. Also physical page turn buttons are really nice.