Doesn't using both tools really have the same goal? The difference is that Tor is free and it's a browser like any other with the difference that it provides the best level of privacy you can get at the moment. On the other hand, any VPN, regardless of whether it is paid or free, is a far worse option considering that it stores user data and shares it at the request of the authorities.

Of course, people use VPNs a lot more because that way their surfing speed is much higher than is the case with Tor, which is still much more sophisticated in terms of the privacy it provides, but because of that it is also a little more demanding to use.

But Tor cannot provide absolute anonymity, because if you have done something very bad, there are security services that can find your real location, regardless of how you tried to hide it.