“CSRS is much, much better than FERS”
That is a very controversial subject—and the correct answer is “it depends”.
The reason is because of the TSP-government match (government equivalent of 401K) portion of it.
Many federal retiree baby boomers “rode the wave” of a red hot stock market over recent years—and if they were heavily invested in stocks (in their TSP) then they outperformed CSRS.
And many got burned in 1995-7, just like we all did.