Logic's compressors and channel eq are pretty good. It depends what material you are working with and what effect you want to achieve...
Waves & UAD are well known as having great sounding compressors etc...
I think Logic's Compressors' circuit types extra modes (Platinum..etc) have provided quite an interesting variation to the compressors sound.
I love the Channel EQ but there are others who prefer more expensive EQ plug-ins from other 3rd party manufacturer's.
My personal take is that I can achieve practically everything I need, plus more, using Logic's built-in instruments and plug-ins.