I see so many students struggle when choosing a monologue to perform for an audition.
Don't spend vast amounts of time looking for the perfect monologue! In effect you are trying to make the monologue do the work for you.
Find one that has one or two things about it that appeal to you and resonate with you on the first read, then apply the work to discover the potential of the piece. Once you apply your imagination and make creative choices the monologue will come alive and you will have a sense of ownership of it, as you will have made it your own.
Most monologues will serve your purpose in an audition scenario, which is to demonstrate your courage, creativity and commitment.