Which e-ink android tablet to buy for writing?

I'm planning to buy an e-ink android tablet for writing since LCD screens gives me an eyestrain in the long run. Though Freewrite is a good option, I'm on a limited budget so I'm thinking of just buying an e-ink android tablet and put a Bluetooth keyboard to it. I'm looking at the brands of Onyx Boox and Meebook, though if there are other brands you can suggest, feel free to comment them down below. Thanks!