Comparing Bandwidth Costs of Amazon, Google and Microsoft Cloud Computing (2017)
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There are also newer innovations that aren't discussed in that comparison, like Google's Commited Use Discounts and Azure Reserved VM Instances (their answers to Amazon's Reserved Instances). If you're using AWS, my company, Usage.AI, has built a tool to automatically buy and sell Reserved Instances [3] to cut EC2 costs while providing flexibility.
[1] https://techcrunch.com/2022/03/14/inflation-is-real-google-c...
[2] https://aws.amazon.com/blogs/aws-cost-management/amazon-ec2-...
[3] http://usage.ai