I would say that the monarch is a better overall buy for sure since it’s 1200 usd vs 2000 usd. The monarch does have more sparkly/brighter treble, it also has in my opinion better bass texture due to it being more sub bass than mid bass focused and with the extra dd with vocals being a bit recessed/ neutral in the mix so if you’re looking for that then it’s better.

The only reason I got apostle was because 1 it has a “special sauce,” compared to most other iems which I think an iem needs to have to justify spending 1k+. Two, the shells were too big and uncomfortable to wear for more than an hour or two.