It goes a little deeper though.
The quote about not wanting to divorse at the same time isn't mine and has been attributed to many. Because it's funny, and (reportedly) inherently true for anyone with a decade of wedlock to speak about.
The remark on picking your battles, in contrast, is in no way as simplistic as you seem to suggest it is -- pardon if I misunderstood.
In essence, psychological studies back that idea, and researchers on the topic are able to predict with relative reliability whether a young couple will survive 5 or 10 years or not.
The gist of their criteria, as I understood it anyways, amounts to whether either or both of the two have a giant ego trip or not.
So if you want a long-term marriage, which most people do when they say yes, well... learn to give up on what's not so important in retrospect, and pick a partner that does -- or will probably learn to do -- the same.
The less fighting, the less likely either of the two wants to divorse. And that gets us back to the first point.