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> The other big thing, in comparison to cloud software, is convenience. You can setup a crawl and start it running -and see URLs being crawled - within a minute.

This depends on implementation. If the architecture is modern and well thought, using dynamic scaling or even AWS Lambda, the result should be available much faster on the cloud software due to ability to parallelization. You can only have so much network bandwith / CPU power locally and if you need to crawl hundreds of pages to get your result, it matters a lot.

Disclaimer: I'm building a SaaS tool for SEO which also involves page crawling.