I would say a portfolio review is baseline/could potentially answer what a whiteboard challenge is meant to suss out. But if there's remaining q's about someone's thought process/the team wants to understand what it's like working with that person, it could be valuable to do both

Do people prefer whiteboard challenge or portfolio review?

I’ve rarely done an entire portfolio review. Most companies ask for a case study of 1 or 2 projects. 

Whiteboard test is usually preferred over a take-home design test however.

Interesting, I’ve never done a whiteboard challenge, and I’m not a fan of take-away home exercises..

I think it depends. Whiteboarding tells you how well the interviewee can collaborate with the team vs take home is if you want to see how deep they can get into a problem.

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