One of the great Cable and Deadpool stories is when they team up against some common enemies in the seedy underbelly of the Marvel Universe. Their contrasting personalities, with Cable's serious and brooding nature against Deadpool's zany and talkative style, create really interesting dynamics.
The story arc where they travel through different dimensions together is also a top one. Cable's knowledge of the multiverse and Deadpool's ability to adapt (while cracking jokes all the way) makes for an exciting adventure. In this story, they encounter various versions of themselves and have to figure out how to get back to their own dimension. It shows their friendship growing and the trust they build in each other.
A really good story involves them working together to stop a powerful mutant from starting a war between mutants and humans. Cable has his strategic mind and powerful telekinetic abilities, while Deadpool uses his unorthodox fighting style and regeneration. The story is filled with action, humor, and some really touching moments as they realize how much they rely on each other.