[Paladin]

I prefer to have a single cargo compartment... Even if transporting population in them is a bit pushy, it is so much simpler taht way... Besides, a container is a container, wether it holds people&LifeSupport, or guns, or Fighters, or etc.
It is logical that any ship capable of landing on a planet can act as a troop-dropping hauler, but not as efficiently... The same goes for Transports who launch fighters, they should not be as (more?) efficient that dedicated carriers...

(What is even stranger is that a single troop-loaded ship could capture a planet by itself...;-)