Research depth
Discovery
How well the tool supports keyword, competitor, SERP, backlink, or market research before execution.
AlsoAsked
Strong depth for People Also Ask and intent-map research, but narrower than a full SEO suite with backlinks, crawling, and rank data.
The homepage describes live People Also Ask data, intent clustering by Google, country, city, language, search-depth controls, Deep Search, bulk searches, and a case study using the data for long-tail keyword growth.
Semrush
Deep keyword, competitor, backlink, and domain research workflows are explicitly documented.
SEO Toolkit lists competitor research, Keyword Gap, Keyword Overview, Keyword Magic Tool, backlinks, and related reports: https://www.semrush.com/kb/806-seo-toolkit