When comparing Final Cut Pro X vs Lightworks, the Slant community recommends Lightworks for most people. In the question“What is the best video editing software?” Lightworks is ranked 10th while Final Cut Pro X is ranked 12th. The most important reason people chose Lightworks is:
Lightworks has been used to edit movies such as Wolf of Wall Street, 28 Days Later, Pulp Fiction, The King's Speech and many, many others.
Specs
Ranked in these QuestionsQuestion Ranking
Pros

Pro GPU utilization

Pro Powerful media organization

Pro Resolution independence

Pro Real-time graphics and effects

Pro 64-bit architecture

Pro Native format support

Pro Full high-quality pro-res support
Pro Integration with Motion

Pro Multicam editing

Pro ColorSync-managed color pipeline
Pro Hollywood approved
Lightworks has been used to edit movies such as Wolf of Wall Street, 28 Days Later, Pulp Fiction, The King's Speech and many, many others.
Pro Highly polished editing workflow
Lightworks is very focused on just the editing workflow. It's full of functionality that eases the workflow. For example, media manager can be used to storyboard, "mark and park" can be used in timelines, cut points can be adjusted in 3 ways (end point of a clip without adjusting the start point of a clip that comes before it, start point of a clip without adjusting the endpoint of a clip that comes after it or start and end points of 2 joined clips at the same time) without shortcuts, just intuitively placed mouse hover points around the cut point. Such attention to detail is what makes it an efficient tool for editing.
Cons
Con You need lots of plugins
For example tracking is something Final Cut can't do. Only with a plugin which costs (example) around 100$.
As well as for advanced colour correction you have get a third-party plugin.
Con Important compatibility and format issues
Breaks compatibility with previous versions of FCP and does not support industry standards such as EDL, OMF, AAF. You can export to their version of XML and use third-party tools for a workaround (with limited success).
Con Works only on OS X
Con Color grading is unfamiliar and nonprofessional
Especially compared to Premiere's Lumetri Color Panel in 2015 cc.
Con Free version is limited to 720p output
Whereas the full version can export to a wide variety of formats and resolutions, Lightworks can only export H.264 / MPEG-4 up to 720p.
Con Doesn't support multi-frame rate videos
Unlike the other video editor, this one doesn't support multi-frame rate video.
