[Tempest1981]

What makes one quantum computer superior to another? Not number of qubits, I guess? IBM has a 50-qubit machine.

[ajdlinux]

IBM talks about a metric called "quantum volume" that combines number of qubits with error rate to summarise useful computing performance. See https://dal.objectstorage.open.softlayer.com/v1/AUTH_039c3bf...

(disclosure: IBMer, but very different area)

[btian]

Same as classical computers, what makes Intel i7 superior to AMD Ryzen 7?

One that can perform a computation task fastest with least energy would clearly be superior to another.