First of all
This is in fact a switch.
In essence, the user will choose from on of two positions, changing to alter behavior of some other element - a switch.
In this case, the swtich has two "labels", manifested as icons. One of the positions will be in color (selected or unselected, is OP's question), and the other will be in grey.
Grey color in UI
Almost never denotes a good thing. It's either unavailable, not-applicable, dissuaded, or otherwise marginalized.
So, one of the labels on your switch will be marginalized. The question is which,
Why would a switch have a marginalized/prominent position?
I can think of two main reasons for a switch's position to affect the appearance of the "labels":
- Canonical position
If your switch has a default/common/normal/otherwise canonical position, it would make sense to mark it when it's position on the other option. For instance,
- Dangerous position
It should make sense to mark a switch more prominently when it is in a sort of a "safety off" position. For instance, some on-off switches on electrical devices have a little tab that's visible when they're on, so they won't be left on mistakenly. iPhone's ring switch has a little red tab on vibrate mode, so the user will know not to expect a ring. A missile ARM light comes to mind but it's a silly example.
Back to the question at hand
I feel your application of a switch fulfills non of these conditions. While I can sort of understand the reasoning for each of your options, each of them break a lot of human conventions. They do fulfill a role, just not the role you intend them to play.
I suggest you try a different way of differentiating between selected and un-selected. There are many, better ones.
(More saturated color, light border, drop shadow, etc.)
Sorry to answer in a destructive way :)