Question [Q] Which is better: Quadcore A7 vs Dualcore A15?

I have been looking for a device to replace my broken HTC Sensation 4G and im confused,
Guys, which do you think is better* a Quadcore a7 or Dualcore a15?
Please help me..
Thanks in advance!

* Performance and Energy Efficiency.
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Devices:
Samsung Galaxy S GT-i9000 (sources)
ZTE Grand X V90M (Recovery)
Myphone Agua RIO Lite (S4700) (wishing there would be a development)