In terms of scale, I'd say Aurora has much greater potential.
Aurora could run a hundred thousand star systems, each with hundreds of planets and thousands of objects. Star systems including binary, trinary, dual-binary and everything else. Hundreds of races, duking it out on multiple fronts with tens of thousands of ships leaving billions dead in their wake.
Of course, you'd need to run it on some kind of demon supercomputer, but the potential is there.
Or you could make almost any scenario you can think of by mixing and setting up forces. Want a shootout between a heavy raider squad and a multi-million tonne mothership? Sure! SM them in and let 'em rip...or build them up yourself in-game.
What Theo said is also true. With the amount of data tracked about individuals and individual ships, coupled with the fact that there is no pre-set storyline, means that you could pull thousands of stories out of a single game. You could follow a ship and her captain all the way from her birth and first steps out into the stars, through a harrowing tale of action and adventure in distant systems amongst friendly (and not-so-friendly) races, until their final demise in flaming glory years later... or her quiet retirement and dissassembly after many years of faithful service, watched over until her last breath by her captain, who sheds a tear before moving on to his next command. (Some Role-play required)
Technology is also the most extensive, intricate, detailed tech tree I have ever seen in any sci-fi game, bar none.
Ship design is also the most free I've ever seen: No pre-determined designs or class sizes in THIS game! You want a hundred lasers on that warship? As long as you pay the price, you can have it!
Want to fight every enemy race in the game at once? Just like in real life, you can! and just like in real life, unless you're bigger than all of them combined, you'll lose!
Diplomacy is a little lacking though... but I haven't seen a really deep diplomacy system since MOO2...
As for the pandas:
Races folder in your game folder has all race portraits. Game picks a random one. Get rid of the ones you won't like, add in ones you feel lacking.