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Themes and Styling: Filament provides theming support, allowing you to adjust the visual appearance of the admin panel to some degree. However, the level of customization might be more limited compared to building a completely custom UI from scratch.
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Layout and Structure: Filament's layout and structure might be customizable to some extent, but the degree to which you can modify the overall layout and arrangement of components might be determined by its framework.
Based on your requirements for a highly customizable UI with a different layout, theme, and styling, as well as your existing admin UI that you'd like to partially integrate, Nova seems like a stronger candidate. However, it's important to note that your familiarity with Nova's tech stack and your past experience with building a UI that interfaces with Nova's API will also play a significant role in making this decision.