Sigs and rankup for Aegon or Ghost?

Hycrotiac_11

Both champs are at rank 4, 55. Aegon sig 100 and Ghost sig 60. Am planning on taking them both to rank 5 sometime soon. No labyrinth yet, but have done variant 5 and 4. Am currently on 6.3.1, as I just beat the champion a week ago. I have like 90ish generics to use, and my other rank 5's don't need sigs. Who should I sig up, and then who should I rank up first, depending on that sig up?

Kill_Grey

Ghost.

Crcrcrc

Aegon for sigs, Ghost first for rankup

fchskm

Rank 5 Ghost, use the signature stones in Aegon.