Facebook advertising; CPC vs CTR
My current campaign:
Advert set A: CTR (link click) = 0,93% CPC 1,09
Advert set B: CTR (link click) = 0,34% CPC 1,05
Advert set C: CTR (link click) = 0,35% CPC 0,66
Advert set D: CTR (link click) = 0,51% CPC 0,59
Now what advert set is performing the best? Advert set A has the highest CTR, but also the highest CPC. Advert set D has a much lower CTR, but a much cheaper CPC..
Could anyone help me out here? Thank you!