As Esty said, Merry is more of a doer, while Pippin is more of an instigator, even though he doesn't intend to be. Pippin seems to get things rolling, and Merry helps finish them off in the end. I suppose the best example (or the best that I can think of, anyway) would be Pippin's looking in the Palantir causing Gandalf and Pippin's arrival at Minas Tirith, thus beginning the action there, and then Merry eventually reaching the city and helping to finish things off by aiding in the slaying of the Witch-King.
Not sure if that was entirely relevant to the chapter... *sidles off quietly*
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