For me:
Favorites: 1990s, 2000s, 1980s
I think this 3-decade era had the best names because I like the trend in letter usage (lots of Ds, Cs, and Bs). I just think there were a lot of cool things going on with names in this era, and they have a good vibe. This is also back when word names actually sounded good as names.
Least favorites: 1940s, 1950s, 2020s
In my opinion, the trends that are going on right now are just awful. With the exception of names that existed before 2000, I hate the modern -lee and -lyn endings (and their variations are even worse). I'm also not a fan of the using boy names for girls names trend, or the surnames for first names trend. I'm failing to see the appeal.
As for the 1940s/1950s, I think those names were just ugly. I'm not a huge fan of girl names that end with N. A lot of them are barely feminine to me.