I don't even understand what you mean as the difference between "something like RDS" and "something like CrunchyData" -- they seem like similar products to me?
For my own curiosity, I am interested in hearing what features Crunchy adds on top that RDS doesn't have, that folks find pretty useful!
(Timescale -- I think i know, it adds features specifically about storing time series? But I don't think crunchy has additional domain-specific stuff like this? What are the pretty useful features folks find in crunchy that RDS lacks?)