529 Plan or Rental Property to Fund My Kids College?

[Matthew Creel]

In talking with a close friend of mine about my personal real estate investments in 2018 he informed me that he and his wife are seriously considering investing in real estate as opposed to funding a 529 plan for their children's college educations.  He is looking at a 15 year timeline give or take.  I thought I might pose the question here for some well informed opinions regarding the pros and cons for each.  What should they consider in making the decision to fund a 529 or buy real estate?  

Thanks ahead of time for your thoughts and opinions.