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I've rather fancied getting Strange Aeons but haven't gotten round to it. I've been putting some Lovecraft groups together for Fistful of Lead though. The Core rules or Galactic Heroes with the Tales of Horror supplement have everything you need. You can recreate some pretty nasty Mythos creatures with traits.
Are there any advantages or disadvantages to getting Galactic Heroes versus the core rules? I'm interested in getting Galactic Heroes, but I don't know if there are, say, missing weapon stats that would make the core rules a better option for Lovecraftian games.