The best replacement for 9006 is 9005.

The best alternatives to 9006 are rated as following:
★★★★★  9005
★★★★★  h11
★★★  h4
★★★  9007
★★★  h7
★★★  9012
★★★  9006xs
★★★  h1
★★  hb4
★★  h8
★★  h3
★  9005 bulb
★  9007 bulb
★  9003
★  9145
★  h10
★  9005 headlight
★  9008
★  h9
★  9006xs bulbs
★  9006 hb4
  h7 bulbs
  9012 bulbs
  9012 bulb
  9004
  9006xs bulb
  h11 bulbs
  9011
  9005 hid
  d2s

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Speaking about 9006, one probably shouldn't forget about 9012.

Other search terms related to 9006 and their ratings are:
★★★★★ 9012
★★★ 9005
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Google Trends

Scale is based on the average worldwide traffic of 9006 in all years. Click on graph for more.
9006
9005
h11