My wife has a Paperwhite, which I've used, and I have a Voyage. I think the Voyage is superior: I like the completely smooth surface, adaptive light, and (although it's not super important) the higher resolution.

That said, I don't think the cost justifies those features. However, if $80 isn't a big deal to you, I'd recommend the Voyage. It's like a slightly better Paperwhite, in my opinion.