I appreciate the Stormblood soundtrack and their unique theme in every situation you're in. I really enjoy the emotion that the ost is drawing in the MSQ cutscenes as well. The biggest weakness I find in every ffxiv expansion, again in my opinion, is the open world battle music.. final fantasy generally has some really epic "normal" battle themes but there isn't one that I really enjoy in ffxiv yet.

A realm reborn's open world battle themes are slightly remixed depending on the region you're but all sound so uninspiring and the same.

Heavensward's open world battle theme feels so bland to me, I always imagined a theme that reflects an ongoing struggle, which includes a little rhythm to it.

Stormblood's open battle theme is the best one to me so far.. but I kind of wish the battle themes matched more along the instance you're in, like the steppe.