The best replacement for prores is dnxhd.

The best alternatives to prores are rated as following:
★★★★★  dnxhd
★★★★  prores hq
★★★  aic
★★  h 264
★★  uncompressed
★★  cineform
★★  avchd
★★  raw bmcc
★  h264
★  h.264
★  raw bmpcc
★  xdcam
★  fastres
★  dvcpro hd
★  dv
★  cinemadng
★  apple intermediate codec
★  hdv
★  dvcpro
  avid dnxhd
  hq

Your alternative for prores is not listed? Suggest!
Speaking about prores, one probably shouldn't forget about alpha channel.

Other search terms related to prores and their ratings are:
★★★★★ alpha channel
★ mpeg streamclip
You have in mind a companion for prores and it is not yet here? Propose!



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