Who to rank up

Zakrw_317

so i have a 4 star cap iw who is duped and i have a five star havok at r2, and a r4 duped four star ghost. I am stuck on 5.2.2. Who should i use my materials on. Oh and one more thing wheres the easies

SpideyFunko

Cap IW
Havok
Ghost
In that order. Unless you can play Ghost really well, then put her above Havok.