Depends on what you need him for. Since he doesnt have immunities, you really wouldnt want him for AQ. He's annoying on certain AW nodes as well. But really, unless you need two AA in a questing team or split up across alliance content, then you really only need one AA. I'd get your 5* to a minimum of R3 and beat up RoL Winter Soldier to transfer some of that frustration
I don't have either a 4* or a 5* of him... lucky... I really wants me an archangel... But yeah if you don't want to invest as many high-end resources, it's probably a good idea for you to still rank up your 4* one. Either way, hey you've got 2 archangels that you can use. So you have a backup. the 5* one could be used for questing, and then you have your 4* one ready if you need him for AQ or something. and the right hand side of your screen will never feel the same way again...
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Edit: I meant to reply to Narwhal
But yeah if you don't want to invest as many high-end resources, it's probably a good idea for you to still rank up your 4* one. Either way, hey you've got 2 archangels that you can use. So you have a backup. the 5* one could be used for questing, and then you have your 4* one ready if you need him for AQ or something.
and the right hand side of your screen will never feel the same way again...