In most of the benchmark contests I've seen SQL Server does pretty darn well - and if you don't mind locking yourself into the domain, it comes with a lot of bells and whistles for ETL and stuff (SSIS) - and it's been a few years since I was a DBA, but at the time nothing came close - even close - to SQL Studio as an IDE. I'm not saying I'd pick it over PostGRES hands-down, but there are a lot of things going in its favor that merit at least basic consideration.