Due to a recent hype around CBD many brands are popping up like mushrooms. A guy from Germany decided to compare all CBD products available online and publish the results on his website. That's how https://cbd.fm (German version: https://cbd.fm/de/) was born.
You can find a huge range of CBD brands reviews, for example:
and many more.
CBD.fm has reviews based on individual products and also for the whole brand. They cover US, Canada, UK, Germany, Switzerland, Austria and Europe in general.