I have 1M m3 ship space in both the carrier and the Rorqual. In the carrier this means 2 BS.
The Rorqual however: "Due to its specialization towards industrial operations, its ship maintenance bay is able to accommodate only industrial ships, mining barges and their tech 2 variants".
The carrier can take any sort of ship.
Both have 30k m3 corp hanger capactity.
The carrier has a tiny cargo - mostly for jump fuel.
The Rorqual also has around 100k m3 cargo space.
The Rorqual can currently hold 7 clones (until I train a few more levels).