Comment by Tistron

I've used both, and for me mullvad has worked a lot better. They seem more focused on VPN as core to what they do and don't leak data when reconnecting to a different server, and with proton I often experience that my connection stops working if my laptop gas been closed for some time, and the only way to make it work again is to reconnect to a new server. And then it leaks connections for a few seconds.