Background is your base non-combat abilities
If the aspect is just a collection of skills or a minor societal trait with no combat application, it's a background.
Theme is your main combat adjustment
If the aspect is mostly a combat tweak, a few feats, a tactical role, or strategic facilitation,, it's a theme.
Class is your main character gimmick
If the major shtick is large, is multifaceted, or a subsystem of its own, it is best suited as a class.
If the aspect is just a collection of skills or a minor societal trait with no combat application, it's a background.
Theme is your main combat adjustment
If the aspect is mostly a combat tweak, a few feats, a tactical role, or strategic facilitation,, it's a theme.
Class is your main character gimmick
If the major shtick is large, is multifaceted, or a subsystem of its own, it is best suited as a class.
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