Scriptable Objects Confusion regading sprite atlas.

Hi there peeps.

Background : A simple 2d game.

Subject: “Handling different themes”.

methodology:
Using ScriptableObject to store different sprites( UI images, i.e buttons images, panel image, Background Image( almost 15 sprites)). On change theme command I call the ScriptableObject and take the sprites out of the S-Object.

and using 6 ScriptableObjects for 6 different themes in my game.

----------Now------

What to do? declare 15 sprites in Scr-Object and do it like described above? or pack all the sprites in a sprite atlas and declare a function with in ScriptableObject class to get the desired sprite and set it upon receiving change theme command ?

which one is better in your opinion and why? or is there even better solution. Do let me know.

thanks.

??