How do I compare SEO platforms on data accuracy and update frequency when every vendor claims to have the largest database?

SemrushSite cited

“Semrush | Keyword updates range from daily to monthly, depending on popularity; other datasets have different schedules.”

Ahrefs

“Ahrefs | Backlink index receives updates every 15–30 minutes, but complete database refreshes take longer. Keyword SERP freshness varies with popularity.”

Google Search Console

“Google Search Console for your own actual search impressions, clicks, and average positions.”

SISTRIX

“SISTRIX | Keywords are updated daily, weekly, or monthly depending on relevance.”