The Voyage does appear to have a sturdier case than others but generally there is any difference between Kindle's and Kobo's in terms of how robust they are. Certainly if it's the screen that 'spoilt' on your Aura HD, they are all similar in terms of how fragile the screens can be.
If you can still get a Glo HD, then yes go for it, its a good ereader with a nice, evenly lit screen, it won't be any more robust than your Aura HD was though.
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