my vote goes to Lunion - absolutely nothing of interest except a bunch of corp worlds.
Oddly enough, Lunion is the section I like the most as GM simply because it offers the following:
Conditions ripe for Piracy
a backwater region that is RIGHT adjacent to the Sword worlds, which, in the event of a fifth Frontier War, would be ideal for expansion by the Sword Worlders. What surprises me is the fact that the Fifth Frontier War boardgame concentrates only on the areas nearer to the Zhodani worlds, but fails to include those that one of the chief belligerants has as its immediate area of operations. That is like World War II games ignoring the Balkins and Greece as a theater of operations because the bulk of the battles concentrated in the Atlantic from the American's point of view. That doesn't negate the fact that there were battles and armies of occupation in the "lesser theaters".
So, for me? Lunion pre-fifth Frontier War is of interest, and POST fifth Frontier War is of interest. At one point, I even took the time to create statistics on Ianic, as it was central for my upcoming Piracy campaign. Why? Because Ianic is situated between Lunion and Addabbeci - two major trading powerhouses in the region. It has little in the way of surface water, which means that for a world that is trying to avoid having its water stripped away as starship fuel, ships MUST go to the gas giant to get their fuel.
At one point, purely as an exercise - I created the Ianic Refueling Corporation, determined how many space ship were required to go gas giant diving, and bring their contents to Ianic for sale to ships that wanted the fuel. As fate would have it, the ships could not operate on an economic level if they sold unrefined fuel. As a consequence, IRC could only afford to sell refined fuel. Starship captains who wanted unrefined fuel, could spend the days on their own to get their fuel free of charge, or they could pay the refined fuel costs on a first come first serve basis.
In all? I rather enjoyed working with Lunion. Truth be told, I will bring it back into play the next time I run a traveller campaign. It has too many enjoyable plot element capabilities for me to ignore.