I replaced an Integra with a Pioneer SC-27. While I never did a direct comparison with Arcam and the Pioneer I would suggest that the Arcam will have a richer sound than the Pioneer at normal listening levels. Pushing both to their limits with inefficient small speakers, and this happens often with HT, the Pioneer is will be less congested and fatiguing.
I have no experience with Anthem.
I have no experience with Anthem.