The best replacement for fuelband is fitbit flex.

The best alternatives to fuelband are rated as following:
★★★★★  fitbit flex
★★★★★  fitbit
★★★★  up
★★★★  jawbone
★★★★  fitbit force
★★★  jawbone up
★★★  sportwatch
★★  polar loop
★★  up24
★★  flex
★★  sportband
★  nike fuelband se
★  vivofit
★  sportwatch gps
★  larklife
★  nike sport watch
★  bodybugg
★  fitbit ultra
  fuelband se
  nike sportband
  fitbit force review
  basis
  sportsband
  nike+ gps watch
  nike plus watch

Your alternative for fuelband is not listed? Suggest!
Speaking about fuelband, one probably shouldn't forget about nike+ running app.

Other search terms related to fuelband and their ratings are:
★★★★★ nike+ running app
You have in mind a companion for fuelband and it is not yet here? Propose!



Google Trends

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