Rethink vs. NetGuard vs. Proton – which is best?

Which app is best for privacy and blocking trackers?

I have a Google Pixel and am using Proton private network (with kill switch enabled and their NetShield on) because I'm using other products in their ecosystem and it's included.

I've heard that their tracker-blocking / firewall capabilities are not as good as others, but it seems you can't run more than one of these apps at once. Am I better off using a free service like Rethink or NetGuard? Thanks.

app blocking capabilities ecosystem firewall good google google pixel kill network pixel privacy private private network products proton switch tracker trackers