Agree that Nitrogen is #1 and Betcoin #2. I'm not a big fan of 1xbit or Cloudbet but as you pointed out, all ratings guides will be somewhat different.
Me only agree to the top 1 and 2 but about 1xbit I read someone complaining that sites because he can't withdraw his winninh funds.
Actually people reviews is sometimes can't be trusted until you really test it by yourselves. You can see betcoin.ag itself that when I played on there, I never have any problems with it, although the withdrawal takes times but overall they always paying. But after some period of times, issues is coming towards them and proven that they are really a scam site. So if you do not dig it deeper how are you suppose to know that they are a scam site? Luckily, I do not spend much on their site afterwards. You can check on reviews but at least you should test it before judge
In principle, every bookmaker can create problems for players if they abuse his loyalty. Therefore, the main thing when playing on the website of any sportsbook is not to violate generally accepted rules and not to abuse the prohibited methods of the game.