The best replacement for unetbootin is universal usb installer.

The best alternatives to unetbootin are rated as following:
★★★★★  universal usb installer
★★★★★  wubi
★★★★  pendrivelinux
★★★★  rufus
★★★★  lili
★★★  tuxboot
★★★  startup disk creator
★★  usb creator
★★  linux live
★  xboot
  yumi
  imagewriter

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

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



Google Trends

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unetbootin
universal usb installer
wubi