When comparing VIM Guru vs Leuven, the Slant community recommends Leuven for most people. In the question“What are the best color themes for text editors?” Leuven is ranked 22nd while VIM Guru is ranked 34th. The most important reason people chose Leuven is:
People with astigmatism prefer the bright white background since the extra light causes your pupils to contract, which makes your focus sharper.
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Pros
Pro Great support for JavaScript editing in GVIM
Has most of JavaScript covered in VIM - it's particularly great if you are a Node.js hacker.
Pro Helpful for people with astigmatism
People with astigmatism prefer the bright white background since the extra light causes your pupils to contract, which makes your focus sharper.
Pro Helpful for people with deuteranomaly
Leuven is a high-contrast theme preferring blue hues to red ones which makes it easier for people with deuteranomaly (most common form of red-green blindness) to distinguish different syntactical elements.
Cons
Con May cause eye strain
People with blue-light sensitivity may prefer a dark theme.