Well in terms of dimensions, the only significant difference is it's less thick, which will depend on the user as to whether it's a worthwhile change or if it makes the device less comfortable to hold. 60 grams of weight probably isn't making much of a difference.
I think battery life, and easy battery replacement to preserve that battery life over a series of charge cycles, is the main thing that matters to me in terms of iterative improvements over the deck in future models (by Valve or whoever else is making a device). Second would be the screen, which is of course linked directly to battery life - I'm sure the Ally's battery life would be better if the screen was lower res, for example.
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