The best replacement for h11 is 9006.

The best alternatives to h11 are rated as following:
★★★★★  9006
★★★★★  h11b
★★★★  h9
★★★  h13
★★★  h7
★★★  9005
★★★  h8
★★  h1
★★  h16
★★  h8 bulb
★  h3
★  h4
★  hb4
★  h11ll
★  hb3
★  9006 bulbs
  l19
  9145
  9006 bulb
  d2s
  h9 bulbs
  xb35 h11b
  h1 bulb

Your alternative for h11 is not listed? Suggest!
Speaking about h11, one probably shouldn't forget about h9.

Other search terms related to h11 and their ratings are:
★★★★★ h9
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h11
9006
h11b