Ever since X1 was released I've used the QCEQ pretty much exclusively for tracking. I think it is right up there with the best of them. My only issue
was that it was relatively small compared to some. That issue was solved with the 'fly-out' in X3.
That said if one already owned, say, the offering from FabFilter, and they were used to using it, then I don't see a reason for making a switch. Although I do like having it right in the ProChannel for easy access.
You could set up an A/B test with QCEQ and your current fav and see if you can detect in deficiencies or positive aspects of one over the other
Regards,