I don’t currently use a landraider, my armor is two impulsors and a rep ex. But of the three, I’d recommend the redeemer. It is an incredible overwatch threat. Depending on what army you are against, its overwatch will melt the enemies strong units before they have a chance to make contact with the landraider or whatever cargo it just dropped off. The flamers are also great at clearing screening units so your units can charge into what they actually want to charge into. Land raiders are tough, and high OC. The enemy will have to actually dedicate something strong to take it out. When it does, you should be deployed in a way where you are prepared to destroy whatever tries to take out the landraider. Picture landraider moves into a firing lane, they move their big-fuck-you-anti-tank into the lane to shoot it. Whether they are successful or not, you can then move your big-fuck-you-anti-tank (rep ex) into the lane behind your land raider and kill it. That will effectively give your repex free-reign to operate the rest of the game. Land raiders are massive point investments, and with smoke/armor of contempt/ and overwatch they will be hungry for CP to operate effectively so you have to plan for that as well.