The ARC in the Anthem puts it in a completely different league. Not only can you set crossover points but you can significantly improve the quality of your bass output.
I have a Parasound P7 (in storage) and I have to run the bass out to a miniDSP EQ to get the same level of performance.
However, you really should listen to both. In particular, the quality of the DACs, and the final results of the ARC are important.
You should also seriously consider the Anthem integrated. I haven't heard it, but I went from Parasound A21s to Class D (IcePower) and finally to Luxman. My point is, I switched out of the A21 because the Class D was more efficient and sounded just as good. You may find the Anthem as good or significantly better, and for $500 more, it's totally worth it, not to mention reduction in shelf space used.