Ocrevus versus Fingolimod

Hi All

My name is Darren.My son Luke has been diagnosed with MS at age 16.It looks like RRMS.Doctors want to start him on Fingolimod ( Gilenya) but if there are side effects move him onto Ocrevus.He is a serious sportsman and i would like to hear about any side effects you have all experianced with both these treatments