Here's the thing:
1: VPNs are like AVs, you will see comments and reviews that are completely different, ranging from "this is the best VPN ever, using them since 5 years" to "I've tried most VPNs and this the worst ever". I think that's because the quality of a VPN connection and experience will vary depending on physical location, chosen country or server, OS, installed softwares, type of use, etc...
2: many reviews out there or sponsored and i'm pretty sure a good amount of comments on those websites are too, therefore reviews are different based on which VPNs are sponsoring or paying the most.
Unfortunately, some VPNs don't offer a free version or a trial. But lucky for you, Avira has a free version, so give it a try