IVPN initially because it is very privacy focused but now I swapped to Nord because it's basically free if you get cashback offers and it seems to bypass more region restrictions for video streaming etc.
I would note that this list hasn’t been updated in 4 years. How did they gather these rankings exactly? The green/yellow/red categorizations could use some context as well.
This is another great resource, although keep in mind some of the rankings are somewhat flawed, as Tom Spark uses a data-driven approach to ranking. For instance, ExpressVPN is ranked above Mullvad largely because it performs a lot better and is much more polished, but I would always recommend Mullvad over Express.
However, in terms of finding out how VPN's compare in functionality and performance, there is no better resource.