I can only find old benchmarking info for SQL Server. Is there any for 2008? I'd like to see MySQL and SQL Server in equivalent stacks going head-to-head in different load scenarios. I know everyone has their preferences, but shouldn't someone do some neutral testing on implementation and performance?
I can't really see the point of knowing what the relative performance of mysql and mssql on the same hardware is, given the order of magnitude difference in overall software+hardware price of putting them on that hardware. Which one gets you the best performance for a given budget limit would be of slightly more interest, but still not much. Other factors are usually dominant in choosing which is appropriate for a particular scenario.