One is more powerful and potentially louder than the other (depending on whether the values are both measured in the same way i.e. RMS or PMPO).
This value doesn't dictate which is better though, this would depend on the frequency range of the speakers, the quality of the drivers, the cross-overs (if any) and the construction of the speaker cabinet, not to mention the quality of the amplifier.
If you're making an either/or decision, best way is to listen to them both.
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