The best replacement for hss is carbide.

The best alternatives to hss are rated as following:
★★★★★  carbide
★★★★  sss
★★★  cobalt
★★★  hsh
★★★  hh
★★  sss strat
★★  ts
★★  carbon steel
★  cobalt drill bits
★  carbon steel taps
★  hcs
★  hlr
★  standard strat
  carbide end mills
  tube steel
  carbide end mill
  cobalt drill bit
  carbon steel tap and die
  standard stratocaster
  rev x

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

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



Google Trends

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