The best replacement for 15 amp is 20 amp.

The best alternatives to 15 amp are rated as following:
★★★★★  20 amp
★★★  20 amp outlet
★★★  20 amp receptacle
★★  30 amp
★★  20 amp circuit
★  20 amp fuse
★  10 amp
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  5 amp
  13 amp
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Speaking about 15 amp, one probably shouldn't forget about 20 amp.

Other search terms related to 15 amp and their ratings are:
★★★★★ 20 amp
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