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I would stay away from the 4 ply sheathing, too much warping due to the glue up system. Five ply is the best fir plywood is better than pine plywood. If you are shingling over I would advise using 5/8" minimun (I know code is 3/8 but it is not recommended), It will give the nails something to bite into 3/4" would be the best although expensive. Use a vapor barrier (doesn't have to be "Tyvek") rosin paper has been used traditionally: but you can also use slater's felt
15Lb paper for increased waterproffing.
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