It's probably also worth checking your ping to these servers. For me, Cloudflare and Quad9 are around 10ms, while Mullvad is around 40ms, so I take that into consideration when choosing a DNS provider.
FWIW, when I pinged, quad9 was around ~10ms, cloud ~30ms, and mullvad ~150ms. I'm not sure your 40ms would be too meaningful of a difference, but >100ms definitely will.
I wonder if anyone knows a way that I could script up a means for doing this dynamically? Like I can have a preferred order (let's say mullvad, cloud, quad for example since this is reverse my timing) and then ping occasionally and reorder based on that or a threshold (like <50ms)? Could be useful for like a pihole?
