Are you asking about best interview questions or the best interview experience ?
I feel and what I have seen is judging candidates based on their previous experiences, understanding about fundamental concepts, problem solving skills and right behavioral attitude to work together in a team – is a best interview for ASIC design/verification engineers
Also you can read this post on my Quora blog:
https://verificationexcel.quora.com/What-are-your-best-ASIC-Verification-Interview-Questions