If your considering a 2015-19 Expedition, turbos are your only option. Next year 2020, who knows. Every vehicle, even the steady as a rock Toyota's have their problems. Even Rolls Royce isn't perfect. Read through the past few months on 4th gen Expeditions, their quirks, and any Tsb bulletins. Overall the customers that bought them seem to be happy. If you are thinking about purchasing one used, ask for service records, have a mechanic check it over, and pull the trigger if it's what you like. Above all else, purchase a dealer warranty from one of the online dealerships. Cheaper than buying direct from selling lot.
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