As someone who has had both procedures, I think the best option for someone baldness past NW 2- 3, is to start with FUT and max it out that way. Afterward, you can get FUE into the FUT scar and it will look almost perfect if you choose proper doctors.
That way you will always have FUE in the bank for a rainy day. It makes no sense to be really bald and get a huge FUE mega session bc there is not enough donor to sacrifice without it looking thin and destroyed by those tiny scars.