Opposites Attract?

There's always been this ongoing question if people who are polar opposites make better couples or if people who are the same go better together..
It got me thinking that day ( on one of my long bus rides) and this is what I came up with.

Opposites:
If one was quiet and the other was loud, if one was headstrong and the other was agreeable, if one was fun-loving and the other more serious, that's all good right? These two would sorta complement each other, cancel the bad things out and so on and so forth. Cause you can't have 2 loud people or 2 stubborn people, then who would listen? Who would give in?

On the other hand, what if you have one who wakes up at night and one who wakes up early in the morning? What if you have one who loves rock music and one who loves classical and nothing else? Or one who only watches chick flicks and one who only watching action movies? Then there would be nothing to talk about, nothing to keep them together.

Similars:
Again, what if you have 2 people who love to talk, or 2 people who loves attention?
Then both would constantly be fighting to talk, to get the attention, and we all know that's not how you have a healthy relationship.

But they would have the same love for a lot of things in life. They would like the same movies, same music, same life, so wouldn't this bring them together??

My conclusion:
I don't have one.
Maybe there's no way to ever find out.
Would 2 people with opposite personalities but the same interests be the best fit??
Or maybe 2 people with a balance of differences and similarities would be best together.
Oh well, I guess thats just life.
You can never put things neatly into their little categories and definitions, its so volatile.

But it's just something to think about anyway.