Wright on 10 October 2018
Final Fantasy VIII still remains as my favourite.
As for the whole mainline, aside from FFXI and FFII which I have not played, I'd rank them like this:
1. FF VIII
2. FF IV
3. FF VII
4. FF IX
5. FF XIII
6. FF X
7. FF VI
8. FF XV
9. FF V
10. FF XII
11. FF I
12. FF XIV
13. FF III