The best replacement for soju is sake.

The best alternatives to soju are rated as following:
★★★★★  sake
★★★★  vodka
★★★  shochu
★  makgeolli
★  baijiu
★  saki
  shoju
  sochu

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

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



Google Trends

Scale is based on the average worldwide traffic of soju in all years. Click on graph for more.
soju
sake
vodka