From what I've read GCE offers better performance numbers, but I haven't worked with it so can't comment.
I will say I find that Azure's service offerings (blobs, tables, queues, and sql) much easier to get started with, and for less cost than the AWS equivalents, but compute nodes are more expensive and less performant.
I will say I find that Azure's service offerings (blobs, tables, queues, and sql) much easier to get started with, and for less cost than the AWS equivalents, but compute nodes are more expensive and less performant.