There were big, explosive threads on other forums with certain FUT (mostly) surgeons claiming that FUE would never be able to get FUT yields. That FUT will always remain the gold standard.
These claims were only about 5 years ago too. Now, unless you have extremely fine caliber hair, exceptional scalp laxity, or are constrained by price, I think most people would agree that FUE is the way to go.
I think quite enough evidence is out that FUE yields have matched FUT, and that FUE (if done correctly) has less surgical risks. FUT scars can also widen over time, and the surrounding tissue can also be damaged thus making those grafts unharvestable for future procedures.