Which Tablet to buy for reading

Hi,
I have always owned an actual ereader from the Sony T1 and T3 and now I own a Kobo Aura One. But I am not really happy with the kobo I have now. I am having battery issues. I have a ticket in with support but I have been thinking about buying a tablet specifically for reading. This way I could also have access to the web if I needed it. I also like the idea of having a color screen if I wanted it.
Can anyone suggest the best tablet for compatibility with ereader apps and best display for reading for long periods of time? I usually read at night so I am not too worried about screen display in bright light.

Thanks