For kicks, I have been testing a bunch of resource heavy MAME games with the same 139.1 emulator that is on Android and iOS. Tested with my VZW GS3, Excite 7.7, TF300, iPod 5 and iPad 4.
To my surprise, the iPad 4 with A6X in spite of a super high res display performs much better than the other devices. I expected the Tegra 3 with lower res display to perform better, but it did not. It was about the same as the iPod 5 which has the older A5X chip.
I had all the Android devices in performance mode when tested. I would like to test one the newer chipset quad core tablets to see how they perform compared to the iPad. Must admit the iPad with iCade is a sweet combination. I use the TF300 with the iCade too, but the MAME performance on the iPad makes it the better combo.
Tested MAMEReloaded and Gridlee. Of course, the positive for Android is no need to jailbreak to get emus working. I got Gridlee before Apple pulled it from iTunes.