Repulsor or Gladiator Reaper?

For context, I have:

Repulsor Executioner, Redemptor Dreadnaught x2, Ballistus Dreadnaught, Land Raider Redeemer (proxy as LR sometimes), Stormspeeder (can make any variant), Gladiator (can be swapped to any variant)

I'm debating getting another Gladiator to run as a Reaper or have two Lancers, any given game. However, if I'm comparing the Reaper to the regular Repulsor, what would you pick? They seem pretty similar, the Repulsor can carry troops though and is 20 points more.

Any opinions on what is better for killing infantry between the two?

I run Ironstorm.