The best replacement for windows update is microsoft update.

The best alternatives to windows update are rated as following:
★★★★★  microsoft update
★  mbsa
★  automatic updates
  microsoft update repeatedly offers the same update
  automatic update

Your alternative for windows update is not listed? Suggest!
Speaking about windows update, one probably shouldn't forget about restart.

Other search terms related to windows update and their ratings are:
★★★★★ restart
You have in mind a companion for windows update and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of windows update in all years. Click on graph for more.
windows update
microsoft update
mbsa