I don't know - if it doesn't bring anything new to the table, why is it one of the most bought sets? Here are my thoughts on the three:
7965 Falcon - I did a blog about this one: http://community.brickpicker.com/blog/4/entry-399-lego-7965-millenium-falcon-is-it-an-investors-10179-remake/
Short answer, it definitely is better than the last one (that didn't do wonderfully). It is much bigger and the figures are great in it. Being the second biggest Flacon and having the biggest one be close to 3K makes me think this one will do decent enough. 12.5-15% CAGR or so. But there are definitely unknowns on when it will retire, and when the next one will come out. Not sure about it - but a lot of Walmarts did clearance them and none of mine got more. So it could be leaving us this year or early next.
9516 Jabbas Palace - I did a blog about this one as well: http://community.brickpicker.com/blog/4/entry-321-jabbas-palace-will-you-dine-for-eternity-at-the-bantha-buffet-or-will-the-chain-put-a-choke-hold-on-your-cash/
It is tremendously better than the original, again one of the most bought lego sets, and there is the controversy. I wish wish wish it had gone out back in March as it would have skyrocketed, but I think there is still a lot of potential. At the end of the day, it still had a somewhat limited run, a lot of investors are going to ignore it because they are afraid of how many were stocked up on previously, and the original has continued to do well. Plus the Rancor pit = money. I think this one could do 20-30% CAGR .
Also, looking back at the controversy, the set rose to $175 within a few days. I think this shows its potential. I don't think investors were spending that on it, but maybe so?
Jabbas Sail Barge - Guess what, it was in this blog :http://community.brickpicker.com/blog/4/entry-357-the-lego-star-wars-fall-wave-same-old-song-and-dance-part-2/
Retail price hurts this one. And its not exceptionally better than the first like JP. But, its still an iconic set, and it matches well with all the other Jabba sets - including the very good selling JP, rancor pit, skiff, etc. So in the end, it will have good returns, but I wouldn't pay more than $85ish for it, maybe lower to get the type of returns to make it worth it. If the set was $99 like it should be, I think you would see 20% CAGR, but at $120 it will be about 15% or lower.
So the short answer, I think Jabba's Palace has the best. But EOL dates change everything.
Only downsides I see are - no Jabba in new movies and high retail price.