That is amazing and I'm so pleased for you. Fettes may not have been my first choice or even your fist choice but it is one the most prestigious schools in the UK and Scotland and if you have seen a different side to them then maybe we were both a bit snooty!
Go with your gut instinct and where you'll feel the most comfortable (and the one that offers you the most money
). At the end of the day it is still an amazing opportunity for your son. I'll post my congratulations after the 20th.