Vote Sentinel for Lancer 2nd Job
Lancer gears are heavy on defense later once they get into scale armor. Also the Guards in Gridarnia are known as Sentinels despite being Lancers. these Sentinels of Gridarnia are more like tanks than DD.
Sentinels was also originally going to be a 3rd tank class but the FF14 team decided to combine Sentinel into Gladiator.
Sentinel's roles are natural damage reduction tanks like Paladin which Lancer has Damage reduction skills as well such as Keen Fury which improves Parry rate to reduce damage taken.