Search Console vs analytics: they answer different questions
The two tools disagree about your numbers and you cannot tell which to believe.
They measure different events
Search Console records what happened in the results page: impressions, clicks, positions, queries. Analytics records what happened after arrival: sessions, pages, actions. Neither is wrong when they disagree, because they are not counting the same thing.
Search Console cannot see conversion
It stops at the click. Whether that click became a completed task is invisible to it, and that is the number that decides whether the traffic was worth having.
Analytics cannot see the query
It sees a session from search but not what was typed. Diagnosing a snippet problem is impossible from analytics alone, because the snippet lives in the tool that stops measuring at the click.
They disagree, and both are right
Search Console counts what happened in Google's result: impressions, clicks, positions. Analytics counts what happened on your site: sessions, users, behaviour. A click in one is not a session in the other, because people bounce before the script fires, block the script entirely, or arrive twice. This site recorded 42,320 clicks and 132,748 sessions, and the difference is mostly non-search traffic, not error.
Use each for what it can prove
Search Console is the only source of truth for anything before the click: which query, which position, which page was shown. Analytics is the only source of truth for anything after it. Asking either one a question that belongs to the other is how reporting arguments start.
Measured, not asserted
On this site the two together produced the finding that mattered: 42,320 clicks from search, 132,748 sessions recorded, and 26.92% of those sessions ending in a completed task with no account required.
Free tool for this: Search Console Analyzer. No account, nothing uploaded.
Where this goes deeper
Every number on this page comes from one complete dataset: one product taken from zero to 100K+ users on search alone, with nothing spent on advertising. The full argument is Chapter 19 of the book. Five chapters are free to read.