Research depth
Discovery
How well the tool supports keyword, competitor, SERP, backlink, or market research before execution.
Bing Webmaster Tools
Broad first-party research across keywords, backlinks, site structure and SEO issues.
The portal lists Keyword Research, Backlinks, Site Explorer, SEO Reports and Site Scan as current features. https://www.bing.com/webmasters/help/refreshed-webmaster-tools-7c7d2533
Screpy
Covers keyword research, SERP analysis, organic keywords, competitor ads, backlinks, referring domains, and Search Console, but depth and quotas vary by plan.
Feature directory lists Keyword Research, SERP Analysis, Organic Keywords, Competitor Ads, Backlink Checker, Referring Domains, and Search Console: https://screpy.com/features/