We have to also consider the other factors here. A great doctor performing FUE with a patient with good donor and thick hair is probably going to end up looking better than FUT performed by a mediocre doctor with a patient with thin hair and poor donor. There are great/mediocre/bad doctors out there performing both techniques. So unless both the patient and the doctors are robots, tuned perfectly, we will never really be able to quantify these claims.
Also even a great doctor can be amazing at FUE (for a host of reasons) and not as interested in FUT, or the other way around.
Personally the scar does play a factor in my mind. Too many repair cases online to count.
For my money, donor, and NW level, I would choose an amazing manual FUE doctor. That's only because (after countless hours of research) I understand what both entail.