What we’ve found useful with Hunter is that it keeps the job of finding a professional email fairly straightforward.
When we already know the person or company we want to reach, being able to find the address, verify it, and see where the email was found saves a lot of unnecessary checking. That source reference is a small detail, but it gives more confidence before putting a contact into an outreach list.
The interface also stays fairly clean. There isn’t much to figure out before getting to the actual search.