To counter Jean's post - shockloss does grow back and you can easily FUE into the scar at a later date if you want to shave the hair down. Having a thin scar on the back of your head doesn't have to be the death penalty it was years ago. Even if the scar does stretch, then you can have scar revision. If you go for a like-for-like surgeon i.e. comparing a top FUT surgeon with a comparably top FUE one, there won't be much difference in the side effects except that 1) the transection rate is lower for FUT meaning more and healthier grafts from the extraction in that particular procedure and 2) more grafts over the lifetime of the donor i.e. you can go back for surgery more times. You can also ensure you get grafts only from the "sweet spot" with FUT whereas that is much more difficult for FUE if you want any kind of yield. This means less chance of the hairs falling out in the future.
I think one of the issues in this debate is that people will compare a poor FUT surgeon with a great FUE surgeon or, less rarely, vice versa and state that as a win for their preferred procedure of choice. LIke-for-like in terms of surgeon skill, I do not think there is a right/wrong answer just a different set of pros and cons.
I do agree that Erdogan is world class and if you can't afford him in Turkey, and you're set on FUE, I'd keep saving. Pay cheap, pay twice. You'll only be going to him for the repair job anyway. He is cheaper than FUT procedures in other countries from very good/top surgeons with great results.