the keepall is a HUGE symbol and ultimate classical LV, think about your personal style! this helps me pick my bags and it usually works well, in this case think of your personality and personal style are you more a simplistic classic parisian fashion (keepall) or are you classical with a contermorary theme to give a different persepective (evasion) so ask your self and try them on instore see which looks best on you and which you are more comefortable with after all it is yuor bag and they arent cheap.
p.s. this method made me pick between the carrall and keepall i chosse the carryall in the end becuase i am classical with a modern edge which is basically the carryall its the keepall that has been reinvented wiht a modern influence