Hard to say at this point in time.
Maybe a Chieftain due to it's "proper Sci-Fi Dropship" looks. In all due reality, I think it will depend a lot on activity (Combat, Exploration, Salvaging etc) and what gameplay limits may have to say about it. If my current "oribtal lander" (Keelback) can get blown out of the sky with a single hit from a drunken squirrel with a MANPAD, I may need to use something more beefy like the Corvette.
It may also depend on amount of players involved (e.g. Deploying a squad of 4 SRVs with my Beluga Liner), do I have to soften up the target with airstrikes first or do I want to sneak in? Maybe Odyssey will introduce a new ship (line) more dedicated for that sort of activity?
We'll see.