In the MoC Random Assignment Table from FM: 3085, what you see is a fairly conventional array of dropships from TRO: 3057. The designs that have been around and common for a long time. Seekers, Leopards, Triumphs, Intruders are found in the middle of the table. A lot of the TRO 3057 designs that have been around for hundreds of years are in there.
What jumps out is the dropship designs they obviously gained by virtue of their close association with the Capellans. The original Lung Wang would appear to be quite common given its placement on the RAT (at a 10 roll, suggesting it's actually a rather common MoC design in service). The upgraded 3055 Achilles, Kuan Ti, Overlord A3 and the Vengeance DC-PWS appear in the extreme high dice roll ends of the table.
In the 2-roll slot is the Dictator. I had to look that up. TRO: 3075 includes the Dictator and says that it was nearing extinction, with the few hulls left in poor shape, until the MoC suddenly began to have flotillas of new ones over the last 5 years. But from what source it doesn't say and from what I can tell that remains a mystery.
Echoing what others have said. If covert insertion is the goal you probably want something that looks pretty innocent. So ideas like the Mule and other "civilian" designs make sense to me. If we're talking about a small team of spies or something.
If you need a military design to transport more of a military force, the Seeker, Intruder and Lung Wang probably make the short list. Depends on what you are deploying. What size force, what types of assets.
