So a month after finishing Xenoblade 3, I believe its soundtrack is the best in the series, dethroning X for me.
I can't remember the last time I played a game that has stuck with me for so long after beating it... I loved it. The Xenoblade series has solidified its place in my top 5.
I still think 2 is my personal favourite, but 3 is not far behind it... Maybe in time it will take the top spot. Even shed some tears during a couple scenes.