The best replacement for playbook is galaxy tab.

The best alternatives to playbook are rated as following:
★★★★★  galaxy tab
★★★★  xoom
★★★  kindle fire
★★★  ipad 2
★★  kindle fire hd
★★  touchpad
★★  android tablet
★  runbook
★  playbook
★  samsung galaxy tab
★  kobo arc
★  galaxy tab 2
★  apple ipad
★  new ipad
★  motorola xoom
  ipad2
  galaxy tab 7
  samsung galaxy
  apple ipad 2

Your alternative for playbook is not listed? Suggest!
Speaking about playbook, one probably shouldn't forget about bb10.

Other search terms related to playbook and their ratings are:
★★★★★ bb10
★★★ blackberry 10
★★ bbm
★★ z10
You have in mind a companion for playbook and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of playbook in all years. Click on graph for more.
playbook
galaxy tab
xoom