When comparing OneStepBack vs clearlooks-phenix, the Slant community recommends OneStepBack for most people. In the question“What are the best gtk3 themes?” OneStepBack is ranked 7th while clearlooks-phenix is ranked 11th. The most important reason people chose OneStepBack is:
The color combination has been carefully engineered exactly for the purpose of making people comfortable, while staring at the monitor for a prolonged period of time.
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Pros
Pro Easy on the eyes
The color combination has been carefully engineered exactly for the purpose of making people comfortable, while staring at the monitor for a prolonged period of time.
Pro Allows you to focus on what's needed
The design is extremely basic - using just 1 color accompanied by 3 shades of grey, OneStepBack manages to be a very functional theme without adding any flashy.
Pro Good contrast
This theme has a good text and border contrast.
Pro Available everywhere
Clearlooks was basically ported to almost every OS or device so you can even make your virtual guest OS look like your host OS.
Cons
Con Looks old and dated
it's not flat
Con Funky arrow button colors in FireFox
The developer is currently aware of this issue, however the fix can't be made until FireFox has an update.