You have missed the main point on your topic, what criteria you determine for the best way itself. There're many option to buy and sell Bitcoin such as centralized exchanges, decentralized exchanges, peer to peer, bitcoin ATMs, or debit card. You need to provide the advantages and disadvantages on each option, so people can decide the best way for him/her.
Every person have different personality, somebody are ok to give his personal information, somebody aren't and so on. So, the answer will be different to each person.
There are pros and cons in every manner of Bitcoin conversion with fiat so it is difficult to say which one is the best and which one is the worst. On which basis should we say that one is the best or the worst? Is it with privacy? Is it with the price? Is it with the reputation?
And, by the way, please edit your subject of this thread OP. "The best way to convert Bitcoin into real money"? Really? So what is Bitcoin, then? Fake money?