The best replacement for hardline is ghost.

The best alternatives to hardline are rated as following:
★★★★★  ghost
★★★★★  softline
★★★★  stopping power
★★★★  flak jacket
★★★  scavenger
★★★  quickdraw
★★  assassin mw3
★★  softline retail
★  straight edge
★  lightweight
★  cold blooded
★  tuffgrip
  hardline
  sprint team musers

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

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



Google Trends

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