The best replacement for snow leopard is lion.

The best alternatives to snow leopard are rated as following:
★★★★★  lion
★★★★★  leopard
★★★★  windows 7
★★★★  mountain lion
★★★  tiger
★★★  mavericks
★★  snow leopard server
★  lion mac
★  mountain lion performance
★  lion which is better
  7
  lion for mac
  mountain lion newer
  mountain lion better
  wait for lion
  lion differences
  mountain lion speed
  lion os
  leopard server
  mountain lion mac
  mavericks performance
  os x
  clouded leopard
  mountain goat

Your alternative for snow leopard is not listed? Suggest!
Speaking about snow leopard, one probably shouldn't forget about icloud.

Other search terms related to snow leopard and their ratings are:
★★★★★ icloud
★★★★★ powerpc
★★★ rosetta
★★★ app store
★★★ ilife
★★★ parallels
★★ g5
★ unibeast
★ cs3
★ iboot
★ clean install
★ vmware fusion
lion
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Google Trends

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snow leopard
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