Need help with what units to get.

[onyx igloo]

Just wondering if someone could help me out and let me know what banner i should be summoning from? I'm 100% f2p and i don't want to waste pearls on just anything

so far these 2 are the only ones ive touched

[paper pewter]

if you really wanna spend on any of those the shinji is the best option

but you should wait for the end of month banner announcement

[onyx igloo]

Alright I'll save up my pearls then