My husband said he likes the Paperwhite 4, but the contrast is a little darker on the PW3. He has used it both with audible and without. The battery goes down faster with audio but not as bad as my Oasis 2. That's with the light off both. All and all he likes the new Paperwhite. He kept his PW3 and will use that as back up. He also likes that it's waterproof and has more storage.
I still like my Voyage too.
I now have a back up for my back up. There are still plenty of covers for them.