As expected, every brand has its followers.
However, If I look at available specs and bench test measurements, that are naturally more objective than subjective, it would appear that the following could be considered before making a decision:
1) Obviously price, and perceived reliability would rank high but it would be a tough one, due to lack of up to date stats, M Code responded to my request a while ago to try and find more up to date info but have not heard back yet, still..); and price could be all over the map depending on the moment in time, and where the buyer's location (city, country..)
2) Specs - Denon, Marantz, Yamaha are quite even on this, but D+M has an edge if one wants 11+ channel processing.
3) REQ - Not 100% sure, but it is more likely Audyssey XT32 + Editor App is going to be much better, based on my own observations only.
4) Bench test measurements - Denon is currently top, based on the most recent measurements by ASR and AH.
Anthem, Arcam, and other boutique brand like AVRs and even AVP/Cs didn't even come closed regardless of price.
5) Power output - I am of the opinion that this is a moot point if one considers the difference need to be 2 too 3 dB for it to be a significant factor. The difference in output into 8 and 4 ohms between a top model Denon or Yamaha and their mid range models will not be more than 1 dB in most, if not all cases.
To those thinking about Anthem, or Arcam's, I think they are good and capable companies, but in my opinion (based on specs, measurements again..), while they are very capable in making amplifiers, AVRs/AVPs/AVCs might be just too complicated for them, and more belong to mass producers such as D+M, O+I, Y, S that I believe are much more experience and resource to deal with the complexity involved.