Kobo Libre Colour or Pocketbook Era Colour?

I'm looking to move from the Amazon Eco system as I like to have the ability to download my book purchases and have them backed up. With Amazon about to remove this option I'm done with them.

I still have perfectly working Kindles (Oasis and an old Paperwhite) so I can still read everything I've already purchased on Amazon but it's time to move on I think.

So for a change I'm looking at Colour eReaders and see a lot of love for Kobo on here. However I like the look of the Pocketbook Era Colour but I know less about it.

So whats the general consensus on both devices, I know a little about the Kobo store for book purchases but what about the Pocketbook? What storefronts work best with that device and anything worth knowing before buying either?

I should add I've a lot of books on Calibre so how's the side loading experience?