Which key chain would be best for a girl?

So i am a male thinking of giving a key chain to the girl i like and i was just wondering which one is more romantic. I have a yin yang one which is split between the middle so one half is yin and the other is yang. I was thinking of asking her to be my yang or yin because neither one can survive without other and thats what im gonna tell her because i cant survive without her. The other one is a matching key chain that has a infinity symbol and a feather. I could say the infinity symbol means that i will love her forever and never leave her. We are not dating btw. I just wanted to know which one will seem more appealing. Thx!