I'm betting on Ripple
I'm betting on both! They are two completely different systems with different use-cases. The cryptocurrency pie is incredibly large and Ripple does not detract from Bitcoin nor vice versa. In fact, Ripple makes the pie larger!
Even though I can't stand the alt-coins, it is interesting that Ripple will also benefit the alt-coins since it will make them more liquid. You'll be able to spend your litecoins at any merchant that currently accepts bitcoin, when bitcoin "bridges" appear on the Ripple network.
What I keep saying, which unfortunately gets drowned out in the chorus of "scam, bla bla" is that Bitcoin users already have to extend trust! Except for the very few who don't use an exchange... See:
Excellent graphic and I heed your point. I do believe it's possible, and have said so on more than one occasion, that Ripple is good for Bitcoin. That the Bitcoin owners will look at their wallets value soon and say, "Thank [enter diety] for Ripple."
I simply have personal reasons why in the end, my speculation is that only one will survive. It doesn't make it true, it doesn't make it the goal of OpenCoin or Ripple, it just makes it my opinion.
Yeah, tell me more why should I stop using IOUs issued by at least somehow legally regulated corporations, and join the happy lawless Ripple family.