In point of fact, if you want the conservative choice, there is only one source that is applicable, a court of law where the facts are tested. All else is only opinion, until something has been proved and tested, it has no real value beyond that of an opinion. It is the height of hypocrisy to claim one news source as valid and another invalid simply because it is contrary to the other news source, when neither has been tested and proved.
The solution is easy. Create a licensed news profession, a licensed public investigators. Make them legally liable, with custodial sentences of fines, dependent upon harm caused, for any false fact they spread. So as a licensed public investigator, preparing news reports, your story can be counted as fact unless proven false in a court of law, at which time a server penalty is paid for any false hoods. Turn news reporting into a licensed profession with server penalties and the news will clean itself up soon enough, between those licensed news professional to smart to lie and those stupid enough to lie cooling their heels in a prison cell.
Until then it is nothing more than the truth of the highest bidder where truth is nothing more than the lies that fills their pockets with other people's money.