the big difference is that + is more robust for data - more error-checking/correction, better overall structure... but when it comes down to it - they both work fine...
i would recommend a dual-format burner, and buying whatever is cheaper but works in a standalone player if you have one... something to remember is that quality media (like Ritek) can make a big difference - my roommate's DVD player will not play cheap DVD-/+Rs...
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