It's probably pretty rare (though maybe increasing) to have a workload that is ARM-only, so it really comes down to price performance. Amazon claims 40% better

It's probably pretty rare (though maybe increasing) to have a workload that is ARM-only, so it really comes down to price performance. Amazon claims 40% better price/performance on Gravition2 vs. comparable x86. While it varies by workload, for scenarios where this plays out and the architecture isn't important (languages increasingly make multi-arch deployment easy) this (and S3 intelligent tiering) are the closest thing to free money I can think of.