I can only speak on the sgn because that's the only nexus I've owned. If I compare it to the 4 I personally think it's better due to the fact that we have 32gb of HD, removable battery, and more importantly, lte. Hardware wise we're behind, naturally, but those 3 things we have the advantage in really make the phone for me, and lte should really come standard if Google really wants to make the nexus line, even in their tablets.
I would've considered upgrading to the nexus 4 I'd Verizon had gotten it but they really screwed up with the sgn and made them unworthy of carrying the next nexus so I'm not surprised by Google choice
Just my. 02
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