Are 20-ampere outlets better than 15-ampere outlets?

Not necessarily. The rating of 15- and 20-ampere receptacles has to do with the rating of the load that may be connected, and may not reflect upon the quality or capacity of the device itself. The parts of the NEC that deal with outlet ratings (2002 NEC 210.21) treat 15- and 20-ampere receptacles a little differently from higher-current receptacles.

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