EXE: just over a month old; similar to VTC but with some significant tweaks (faster block time, more aggressive N-factor); active dev and growing community; Android wallets; solid website and marketing efforts; currently "recovering" after recently being listed on a whole bunch of new exchanges, so the price is a little depressed; realistically positioned as the #2 scrypt-N coin after VTC, which is a pretty good place to be once scrypt ASICs dominate; with luck and some hard work, maybe a chance to be better than #2, which makes it a worthwhile gamble given the current difficulty.

There's also a different vibe around EXE, I find.  It's been building slowly, the community has been growing nicely and is helpful and active, and so far there hasn't been any pump and dump hysteria and FUD.  Pretty calm and rational.  Sort of the Toyota Camry of coins, and I mean that as a compliment.

I'm sure others can give you a more technical rundown