I guess this is really a personal preference thing... I don't like the features that the Lariat trim package offers because they usually are equipped with a console instead of a middle seat, carpet floor instead of vinyl and a navigation system instead of a normal radio. Sometimes they even have a sunroof and I don't understand why trucks even offer sunroofs at all. I played with the power fold mirrors and they were fun for about 3 minutes but that got old quickly. But you might like to have those features...

I would get the new one, then you know the entire story of the vehicle.

It's difficult for me or anyone to critically analyze the options for you if there is no mechanical advantage or disadvantage as you mentioned.