ProtonVPN or Mullvad? Why would you choose one over another?

I'm thinking about paying for a VPN, I currently don't use one.

I'd like to use Mullvad but they don't seem to have regional prices, while Proton does.

I wonder if Proton is still a reliable option, Proton is 60% cheaper in my country, probably because regional pricing (but I didn't check if it's really the case).

If anyone has any other suggestion I'd like to hear it.