The best replacement for nvidia shield is ps vita.

The best alternatives to nvidia shield are rated as following:
★★★★★  ps vita
★★★  ouya
★★★  razer edge
★★  mojo
★★  steam box
★  splashtop
★  open pandora
★  jxd s7800b
  tegra note 7

Your alternative for nvidia shield is not listed? Suggest!
Speaking about nvidia shield, one probably shouldn't forget about splashtop.

Other search terms related to nvidia shield and their ratings are:
★★★★★ splashtop
★★★ ar drone
You have in mind a companion for nvidia shield and it is not yet here? Propose!



Google Trends

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nvidia shield
ps vita
ouya