usability – Dropdown with – progressive disclosure with accordions vs chevrons

What is the best UX for the user? Expanding the field in the same dropdown or opening a new dropdown?

The first image presents an accordion option when the user is able to preview the content in the same dropdown.

P.s. If this is the best option what should be a behavior when a user opens another section? Should other still be opened?

  1. Second option presents a dropdown with a chevron. When a user clicks chevron then another dropdown with the category options expands.

enter image description here
enter image description here

What do you think is the best UX?