Research depth
Discovery
How well the tool supports keyword, competitor, SERP, backlink, or market research before execution.
Serpstat
Very deep SEO research coverage across keywords, domains, competitors, backlinks, PPC, and SERPs.
Features lists keyword research, competitor/PPC analysis, backlinks, batch analysis, clustering, and keyword trends; https://serpstat.com/features/
Ubersuggest
Deep SEO research across keywords, competitors, backlinks, domains, SERPs, and AI data.
The product page lists a 100-million-keyword database, competitor analysis, backlink opportunities, traffic estimation, and ranking tracking: https://neilpatel.com/ubersuggest/