Yeah there aren't many changes to the battle system but it's fundamentally very good, requiring very few tweaks.
Regardless, BW > plat > HGSS > dpp of the recent games. BW does some entirely new things, has the best story, and the best set of Pokemon; the individual Pokemon are better than RBY's imo.
Plat is just a very polished, excellent game, and HGSS is great too - it just suffers from some of the basic flaws GS had. It does a lot to arrest some of them, though.
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XIII_rocks, the cream of XIII fanboyism.