Pihole is good to affect an entire network of devices without anything needed on the device. Ublock is good to affect a single device on any network, like your phone while outside the house. I use both as well as rethink which when in DNS-only mode does basically what pihole does at the device level. Of course, each has other functionality as well with various advantages and disadvantages, but at a high level they are not exactly an either/or kind of thing necessarily.
Pihole is good to affect an entire network of devices without anything needed on the device. Ublock is good to affect a single device on any network, like your phone while outside the house. I use both as well as rethink which when in DNS-only mode does basically what pihole does at the device level. Of course, each has other functionality as well with various advantages and disadvantages, but at a high level they are not exactly an either/or kind of thing necessarily.
I have been having a rough day, I think I meant AdGuard I use Ublock on device as well