I don't mindphraseEither choice is acceptable to me.“Is the window seat okay?” “I don't mind.”Either wayphraseBoth options are fine, or the result is the same.“Bus or train? Either way works for me.”I'm fine with whateverphraseI'm okay with whichever option you choose; casual.“Order what you like. I'm fine with whatever.”Up to youphraseYou can make the decision.“We can leave now or later. Up to you.”No preferencephraseI don't like one option more than another.“Tea or coffee? No preference.”