Who's better og optimus, starscream, or ultra Magnus

Insanecloud

I currently have a 3* ultra Magnus and starscream but I don't know how is the one I should invest ore in to fully upgrade an I can't tell who is stronger since one is rank 2 an the other rank 1.
Thanks

Insanecloud

Or should I wait till I get an of optimus

Gunz0

G1 Optimus if you need an offensive bot
Ultra Magnus for base defense
Starscream is only good if duped

Insanecloud

Ok thanks man