Hello, and thanks for the question AND for playing VoltAge:Genesis!
To answer your question, the "winner" of the battle for Oca Rongo will open a shop, with each one stocking a different variety of supplies...the big "get" for the Scavver side is the Machete, which is a decently powerful 1H Tool which will open up some extra treasure opportunities and also works with several items that grant elemental "Blade" skills...the Deadhanders offer some decent gear, but nothing super rare or OP. Helping the Deadhanders, however, will also grant you a reputation boost with their faction, helping you to gain access to their home base of Ensenada (the abandoned air field north of New Panavinto. Even MORE interesting...
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There's actually a "secret" resolution to the conflict where everyone gets what they want, and you get access to even better gear than normal from BOTH factions. Finding a peaceful resolution may take time, however...most people won't figure it out on their first playthrough :D