12 trips bos-ord is ~ 20k mi on non stops if there are any...so w/5k more i believe you would be ist tier elite on either next year....if you are flying 1st class, there may be other considerations....

how much leeway do you have in routing & price of your trips?

what eqm have you accrued on ua & aa this year?

good luck....

edit to add...eqm is mi toward status...