When comparing Flat Remix GTK theme vs OneStepBack, the Slant community recommends Flat Remix GTK theme for most people. In the question“What are the best gtk3 themes?” Flat Remix GTK theme is ranked 5th while OneStepBack is ranked 7th. The most important reason people chose Flat Remix GTK theme is:
The additional color options are all very well thought out, too.
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Pros
Pro Very clean look
The additional color options are all very well thought out, too.
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.
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.