My favorite poker room is Pokerstars. I tried 888poker and partypoker and i really don't like them because of the small pool of the tournaments. So i'm playing only on Pokerstars right now and i feel good about it and its enough. I don't need any other poker room. I got all of the tourneys on Pokerstars i want to play.
IMO ACR is the best of the available options I currently have to play online. I would rate it above the nearest live cardroom barely because I can multi-table in my PJs while smoking versus driving ~40 miles. The very frequent DDoS issues concern me, but it has gained the tepid trust of my better half who is aware of the 'gray' area nature of my hobbies but has seen it result in money in the bank.
Really hoping the recent SCOTUS sports betting decision is a breach in the dike that will bring back the good old days even if it involves fed/state oversight and taxes.
The best choice, no doubt is PokerStars and 888. PokerStars has a great selection of interesting tournaments at a time convenient for me, and 888 has a fairly large selection of freerolls and various types of promotions.