Hmm, looks like they're competing directly on price:
1 virtual core, 1.7GB RAM, 160GB disk for $.055/hr (Google)
1 virtual core, 1.7GB RAM, 160GB disk for $.08/hr (Amazon)
Amazon is still much cheaper if you use reserved instances or spot pricing, though. And for these sorts of compute jobs, I'm not sure why you wouldn't use spot pricing.
1 virtual core, 1.7GB RAM, 160GB disk for $.055/hr (Google)
1 virtual core, 1.7GB RAM, 160GB disk for $.08/hr (Amazon)
Amazon is still much cheaper if you use reserved instances or spot pricing, though. And for these sorts of compute jobs, I'm not sure why you wouldn't use spot pricing.