The best replacement for opeth is dream theater.

The best alternatives to opeth are rated as following:
★★★★★  dream theater
★★★★★  tool
★★★  porcupine tree
★★★  mastodon
★★  meshuggah
★★  between the buried and me
★★  agalloch
★  amon amarth
★  katatonia
★  otep
★  in flames
  bloodbath
  btbam
  enslaved
  dream theatre

Your alternative for opeth is not listed? Suggest!
Speaking about opeth, one probably shouldn't forget about steven wilson.

Other search terms related to opeth and their ratings are:
★★★★★ steven wilson
★★ gene hoglan
★★ katatonia
You have in mind a companion for opeth and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of opeth in all years. Click on graph for more.
opeth
dream theater
tool