The person who decides gains information the undecided person cannot access.

There is knowledge you can only get by committing. Standing at the fork, you can model both paths forever and still not know what either one feels like from the inside, because the information is generated by walking. The undecided person is not gathering data; they are waiting for data that will never come to them.

When a decision has stalled for weeks with no new facts arriving, that is a sign that further thought will not resolve it. Choose the direction you can most easily learn from, and treat the first months as reconnaissance. What you find out will be more useful than anything the analysis could have produced.