You should just use them for masking traffic on your local network (but not the VPN provider, or their data center, or their ISP), your ISP (but not the VPN provider, or their data center, or their ISP), appearing to come from a different location to the service you are trying to reach, circumventing rate limiting (don't be surprised if you find someone else has already used your VPN's IP for this). And that's it.
None are better than the others for greater privacy such as in lawsuits, warrants, possibility of data being tapped at the data center location, assurance against logging, or protecting you from a criminal indictment. There is no way to prove that any VPN is good for privacy except for their own claims, even if you find a court case that was stonewalled in a way that matched the privacy claims that only is about that particular point in time, you have no way to know about the present or at any point in the future.
Yes, this includes your favorite VPN, that you read about on your favorite blog, or was mentioned by your favorite most trusted youtuber. No, their claims about being in a bunker in Switzerland doesn't increase the viability of their claims.
And yet, looking up VPNs on a search engine are only going to get you these affiliate marketing websites, harping on and on about all the privacy benefits of some particular one thats doing things oh-so-differently.