I liked the level design for the combat arenas quite a bit. I'd say technically it's the best of the series, although since setpieces are the main feature of the series I'd go with 2 as my personal favorite.
If I had to rank them I'd say 4>2>3>>>>>1
havent played Lost Legacy yet.
I make game analyses on youtube:
FFVI: https://www.youtube.com/watch?v=mSO6n8kNCwk
Shadow of the Colossus: https://youtu.be/9kDBFGw6SXQ
Silent Hill 2: https://youtu.be/BwISCik3Njc
BotW: https://youtu.be/4auqRSAWYKU