any competent opinions on protonvpn vs mullvad vpn?
Proton VPN is very questionable - sleuths have figured out that it's just a white-labeled version of NordVPN. But the trail is a rabbithole, and you might not be personally satisfied with the standard of evidence. Here is a start for you: https://news.ycombinator.com/item?id=23571653
And since the link to [2] in what I linked above is broken, here is the archived version: https://archive.is/iZ2l2