Repeat after me, “A song is won, or lost, in the mix”. Of all the important colleagues you will have in the music industry, none is more important than the mixer. Sometimes this is the same person as the producer, or may have other hats as well.
Listen to samples of anyone you would have mix your music. If they don’t move you – go to someone else. If they don’t fit your style in a way that you can envision – move on to someone else.