The best replacement for dmg is iso.

The best alternatives to dmg are rated as following:
★★★★★  iso
★★★★★  tmg
★★★  zip
★★★  cdr
★★★  exe
★★  img
★★  pkg
★★  tar
★★  crit aura kingdom
★★  ipsw
★  tmg autism
★  sparse image
★  iso mac
★  sparsebundle
★  fsp
  fabfilter
  armor pen
  crit chance
  mazak
  dimethylglycine

Your alternative for dmg is not listed? Suggest!
Speaking about dmg, one probably shouldn't forget about power iso.

Other search terms related to dmg and their ratings are:
★★★★★ power iso
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