Hplvl give the best midgame they break even at lvl 6 or around , so if you can survive early you ' ll be having a lot more health , flat armor give a stronger early game minions deal physical damage , most champions trade with autos early game and are a must on some junglers jungle mobs deal physical damage too due to how resistances work your first 10 points on armor reduce more damage than the next 10 , so a bit of armor matters a lot but fell a bit more later in the game . Flat hp and armorlvl are both highly situational . For % hp you have quints only iirc , and they ' re something you ' d grab on Sion or that kind of Hp stacking champions . It ' s a tradeoff between being stronger earlier on or later really . For example , I play a lot of Poppy top and get an early sunfiretabis most of my games , so unless Im on a really bad matchup think Darius I ' ll get hplvl and get away with it . If you play , say GP into Jayce , you better run armor seals . Anyways , this isnt going to be that hard of a change , just by running armorhp yellows your trade patterns and overall matchup wont change a lot , so you can mostly get away with grabbing hplvl or armor seals and using them always .