Seeking Recommendations for Best Email Validation Tools

what's all! Looking for some recommendations here! Been using BetterContact as first layer of go-to and then Clay Waterfall to fill in the gaps. I've been using Zerobounce inside of ClayWaterfall with my own API. Heard it's best in class so just started with it. But as im finishing up my credits there wanted to see if everyone have different recommendations for email validation tool? (accurate validation would be priority)