Need an expert Advice about PostgreSQL/Mysql/Mssql , which one to use?

Need an expert Advice about PostgreSQL/Mysql/Mssql , which one to use?

Hi there everyone, i'm thinking about which one to use for (Faster) Performance , i will have around 1000000 requesters, maybe more and around 500+ daily requests, need an expert advice which of those database i should use to avoid performance issues and work faster in Service Desk plus application.

Thanks!

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