Email Verification Tools: Debounce vs. ZeroBounce Comparison

Hi! The last few weeks, when searching for people's emails, I am finding less than “normal”. I don't know if something has changed or if it's just bad luck. I don't know if it could also be because the verifier has become stricter. I always use “Debounce” but Clay defaults to “ZeroBounce”. Does anyone know which one works better (among all of them, not only these two)? Some time ago I used ZeroBounce and I had a lot of rebound problems, I don't know if it has changed. Debounce works well but I don't know if it is too restrictive.