The best replacement for quickoffice is documents to go.

The best alternatives to quickoffice are rated as following:
★★★★★  documents to go
★★★★  pages
★★★  iwork
★★★  documents to go ipad
★★★  docs to go
★★★  documents to go android
★★  kingsoft
★★  google docs
★★  officesuite
★★  iwork ipad
★★  quickoffice pro hd
★★  microsoft office mobile
★★  office suite
★  adobe reader
★  numbers
★  openoffice
★  iworks
★  quickoffice pro
★  documents to go iphone
★  dataviz
★  office2
★  documents to go for ipad
  docs2go
  pages for the ipad
  smart office 2
  polaris
  numbers ipad
  polaris office
  document to go
  cloudon
  officesuite pro 7
  office2 hd
  pages for ipad
  doc to go
  google drive

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

Other search terms related to quickoffice and their ratings are:
★★★★★ skydrive
★ dropbox
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Google Trends

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