Amazon doesn't offer graviton in the open market. You can only get those chips if you buy AWS.
Graviton is a standard N1 neoverse core, which is slightly slower than a Skylake Xeon / Zen2 EPYC. There's hope that N2 will be faster, but even if it is, we don't really have an apples-to-apples comparison available (since Amazon doesn't sell that chip).
The most likely source of Neoverse cores is the Ampere Altra, which is expected to have N2 cores shipping eventually. As usual though: since Ampere has lower shipping volume than other companies, the motherboards are very expensive.
x86 (both Intel and AMD) have extremely high volumes: so from a TCO perspective, its hard to beat them, especially when you consider motherboard prices into the mix.
Graviton is a standard N1 neoverse core, which is slightly slower than a Skylake Xeon / Zen2 EPYC. There's hope that N2 will be faster, but even if it is, we don't really have an apples-to-apples comparison available (since Amazon doesn't sell that chip).
The most likely source of Neoverse cores is the Ampere Altra, which is expected to have N2 cores shipping eventually. As usual though: since Ampere has lower shipping volume than other companies, the motherboards are very expensive.
x86 (both Intel and AMD) have extremely high volumes: so from a TCO perspective, its hard to beat them, especially when you consider motherboard prices into the mix.