How Should We Decide Between Two Slightly Different Eye Prescriptions For My Son S Glasses?

Good morning Doctors, My 24 year old son got his eyes tested last week at 2 places. One place reported -5.50 spherical power and -2.25 cylindrical power in both eyes. The other pace reported -5.75 spherical and -2.50 cylindrical power. Please could you advice us on how to decide which parameters to be considered for his glasses? Thank you!