As an evil character, there are a couple of truly hilariously evil things you can do to your companions. If you want to be a bad-ass good guy, or a bad-ass evil bastard, 1 probably has more truly 'heroic' and 'dastardly' deeds you can do - that is, straight up good/bad choices with not so much in the way of introspection or second-guessing. In contrast, 1 has a more 'standard' SW plot - although there is a twist partway through (albeit a pretty obvious one). Then again, maybe you'll be like me (and many others) and consider this story 'fresh' because of it - not to mention the interesting characters (generally damaged characters) that accompany you.
A lot of people like 2 better than 1 for these reasons however, that's not really related to fun/entertaining (necessarily) - and if you're expecting a more 'standard' Star Wars experience (clear good guys, clear bad guys, SW power game), then you need to be aware that it is most definitely subverting the Universe in ways you may not like. Personally I prefer 2, due to the better (somewhat SW-Universe-subversive) plot, the fact you can turn a lot of your companions into Jedi, and all that. is more fun and entertaining? That's a tough one.
VeryBumpy: Say I have ADHD, which will wow me and hold my interest longer? i.e.
