Ayone who hasn't seen Filthy Rich, go for it! It's almost like seeing another season of Bottom, but with an extra character (Nigel is great as world-weary, lecherous, chain-smoking "impresario" Ralph Filthy --- "Hello Filthy Ralph!" "That's Ralph Filthy, Eddie!"), and some (indeed, most) of the episodes are easily as good as the Bottom ones.
I guess you look at it this way (as they were made)---
Young Ones = training/proving ground
FR&C = Getting well into their stride, confidence and fun
Bottom = Masters of their art
No need to choose, as it's a clear evolution from one to the next...