I really think all 3 are top 10 world wide.
Feriduni has an amazing aesthetic taste, he is metulicious af and a very heartwarming guy. Really like his hairlines. He does large fue cases and no fut anymore except corrections. He thinks there is no need.
Hattingen is amazing with big sessions, and they are known for this, do fut for large sessions, do more fut than the other two.
Hasson and Wong are the docs who literally shifted the needle of "whats possible". Transitioned more to fue last years but still do fut occasionally.