The Black will not go longer, it has the same core, and a solid cover.
The Sniper is a part pearl, the pearl will give you the length and the particle will allow you to handle the carrydown if you run into any. Both balls are great benchmark equip, MHO is the solid will cause you to make more adjustments throughout the 3 game set. I added a light coat of compound on my Sniper, over the 2000 grit surface, now I get 2-3 feet more length with a more pronounced backend, but without the snap. Still crosses the carrydown, still packs a wallop.
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Steve