If you were to analyze an eq curve with something like Q-Clone, you would find out that all eq's are almost identical, but how they implement Q and Cut/Boost is a bit different.
I have been able to null, or almost null (down to -80db) almost every third party eq simply by changing the Q and Cut/Boost values.
The EQ3 is one of the best EQ's on the market, and IT'S FREE
Compressor plugs are a bit different, but the DYNIII is great and I have had many commercially released songs and feature length films mixed with it.
And for $99 the Pro Compressor is the best deal around. Simply put, the best compressor on the market, in my opinion
The tools that come free with PT are world class and there is no need to spend money on plug ins unless you actually know why you want to buy them.