The best replacement for powerglide is th350.

The best alternatives to powerglide are rated as following:
★★★★★  th350
★★★★  th400
★★★  c4
★★★  turbo 400
★★★  turbo 350
★  700r4
★  4l80e
★  350
  trimatic
  lenco
  400 turbo
  t350
  torqueflite
  350 turbo
  openglide
  th 350
  turboglide
  dynaflow

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Speaking about powerglide, one probably shouldn't forget about gear vendors.

Other search terms related to powerglide and their ratings are:
★★★★★ gear vendors
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Google Trends

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powerglide
th350
th400