I have used both interviewing.io and pramp. I think interviewing.io is of better quality. But I do think there is value for pramp since it is a mutual interview

I have used both interviewing.io and pramp. I think interviewing.io is of better quality. But I do think there is value for pramp since it is a mutual interview and we can see how others are answering questions. It helped me a great deal in improving system design interviews.