If you directly correlate a device's tech spec to the expected UX you're gonna get out of it, then you might be clueless too.

There's the software layer on top of it,which is determined by the device's developer-marketplace-customers ecosystem, then there's the vendor's support, then there's a 'softer' social aspect on top of this all. It all determines the 'value' you're getting out of the purchase.

Unless, of course, you buy gadgets just to run synthetic benchmarks on them and post the screenshots online.