Research depth
Discovery
How well the tool supports keyword, competitor, SERP, backlink, or market research before execution.
Dragon Metrics
Deep keyword, competitor, backlink, SERP, and global search-engine research capabilities.
Keyword Research provides search volume history, intent, difficulty, organic CTR, fresh SERPs, filters, keyword lists, competitor research, and Keyword Gap: https://www.dragonmetrics.com/product-tour/keyword-research/
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