The only way I can see X3 being better is when you put the name Summer behind the two movies. Is X3 a better summer movie? Sure, it's dumb, has action and no character development. Just what people want to see on the summer. But as movies, and I mean only movies, I think SR is hundreds, thousands, zillions better than X3. Both technically and emotionally. It's a real, real pity to me that Singer had to leave. I hand't notice his impact to a full extention until yesterday.
And if you prefer X3, ok, I understand, everything I just wrote is simply my opinion. But in my opinion, Jesus, what a pity we changed Singer for Ratner. Singer made two wonderful X-men movies, and made a wonderful Superman movie. His style, technique, careful direction, all the beautiful photography, the camera movements, the way he films Superman: he is a terrific director. So what if the cast gets stressed on set? We're not watching the movie to see the set, we want to see the end result. And the end result is simply marvelous. Singer is brilliant.