6 inches devices/Kobo Clara BW and manga

Does any of you read manga on the Kobo Clara BW (or other 6 inches devices)? Is it truly that bad and small as I've been reading around? Because I'm stuck between buying a Libra 2 for the screen size and a Clara BW for the portability and for the fact that I do like reading my books in a "smaller and more compact way" so I don't know what I should do.

Thanks in advance!