When comparing SEMRush vs Oncrawl, the Slant community recommends SEMRush for most people. In the question“What are the best SEO analytics tools?” SEMRush is ranked 1st while Oncrawl is ranked 8th. The most important reason people chose SEMRush is:
With just a single seed keyword, the Keyword Magic Tool allows you to generate keywords within your niche, including long-tail keywords across specific subgroups.
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Pros
Pro Keyword generation
With just a single seed keyword, the Keyword Magic Tool allows you to generate keywords within your niche, including long-tail keywords across specific subgroups.
Pro Lots of features
More features than any of the other products here with a lot of depth.
Pro Gives more accurate analytics than any other tool
It also gives more updated Analytics Results.
Pro Reasonable free featres
While the pro-features are horribly expensive, you get reasonable amount of features in the free version.
Pro Checks performance
Performance is checked as well - page load times are tracked and displayed by both speed in seconds, as well as size in kilobytes (or megabytes).
Pro Simple graphics
OnCrawl provides data in easy to understand graphics. For each aspect of the page Oncrawl will create a graph showing how well pages on your site score. For example, if the titles are consistently too long/short you will quickly be able to see. Likewise, if descriptions are duplicated or headings aren't used to their best potential you will easily be able to tell.
Pro Scalable
It can crawl up to 250M URLs at 300URLs/sec.
Cons
Con Can get spendy depending on your needs
Con Limited number of projects
Con Expensive subscription
While there is a free all-inclusive 30 day trial, subscriptions start at $19/month ($12.42/month if you sign up for a year-long subscription) which is steep for developing websites. The base plan is limited to 5 websites and 10k URLs per month, but doesn't include any concurrent crawls or custom reports. Prices go up to $279/month ($232.50/month if registered for the year). See more here