The S is specifically for the Wilson "S" rackets like the 99s and 105s I'll go with the regular 4G though I really don't think durability is going to be an issue for with such a durable poly. The S is a 1.43 or something crazy. I only break 18g polys in 16x19 patterns I've never broken a 17 or 16g poly before it was time to cut it out anyway.
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