Well for one, Chaos;Head is part of the same series Steins;Gate is in (it's the first installment, Stens;Gate is the 2nd, Robotics;Notes 3rd, Chaos;Child 4th, Anonymous;Code 5th), so already you'll probobaly like some of the themes and what it does. Chaos;Head is far mre gnarly than Steins;Gate, and leans more into horror and the psychological. The anime is pretty bad, so you'd have to play the VN, which is finally coming out in English in October (I've waited 10 years for this) - there is an english version of the VN out, but it's basically the beta version of the story so characters are less developed etc.
You might not put Chaos;Head, overall, above Steins;Gate, but most tend to say it's more interesting in terms of ideas and atmosphere. If you've seen the Steins;Gate Zero anime, one of the characters in Chaos;Head is referenced in that, but they're linked mostly in that the main villains behind the events of each installment are shared and each story is basically their next phase in their plan. I'll let yu know when Chaos;Head comes out, we might be able to go through some chapters together. Just don't watch the anime LMAO.