I like both, but TS2010 comes with 30 routes (most hidden; you have to untick the yellow star. TS12 only comes with 8, but is more stable and some say they get better performance. There's a strong case for getting both, though if I absolutely had to choose, I'd get TS2010. Or, better yet, I'd get the best of both worlds and support our hobby at the same time and buy both.
