Comps versus Apps which one?

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Hello BP! Need your help. In my attempt to build the financial part of my team (partners, private money lenders) I ran into a road block. I reached out to a friend and showed him an email I received for a property to show him the opportunity. I showed him comps from the MLS not even a mile from the property the was between $80K & $115K. He replies with listing prices that were found on Realtor.com. My question in analyzing properties and getting an ARV which is the most sure to use? I say comps from the MLS. Thanks for your help. Jorge