The best replacement for drop bars is bullhorns.

The best alternatives to drop bars are rated as following:
★★★★★  bullhorns
★★★★★  flat bars
★★★★  aero bars
★★★  pista bars
★★★  bullhorn handlebars
★★★  risers
★★  pursuit bars
★  trekking
★  straight bars
  track bars
  butterfly bars

Your alternative for drop bars is not listed? Suggest!
Speaking about drop bars, one probably shouldn't forget about v brakes.

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



Google Trends

Scale is based on the average worldwide traffic of drop bars in all years. Click on graph for more.
drop bars
bullhorns
flat bars