The consumer VPN heyday has long passed. Most Mullvad endpoints i use are blocked in increasingly more places, including and especially reddit.
It's the only VPN I've tried thoroughly, so i don't know how they and Proton compare today (or, really, ever). The landscape has been degenerating across the board, I reckon.
Mullvad just worked everywhere. I'm going back when my year plan on Proton ends.