Btw, speaking of pros and cons, it would be really nice to have a feature comparison website for different types of technologies (e.g. relational databases, messaging systems, etc). For some, there are Wikipedia "Comparison of X" pages, and to some degree you can extract and discover via Stackshare, but Wikipedia is far from complete and up to date, and Stackshare mostly just shows you who uses what and describes technologies via marketing buzzwords rather than somewhat "normalized" descriptions.