Collection Runner vs Flows


I am wondering what the specific differences are between Postman Flows and Collection Runners. Both seem to pass “variables” to the next request, but I am struggling to see what the differences between the two are. Are there any limitations to Runners that make Flows a better option in certain circumstances for data requests that need to do some processing/concatenation?

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I too have this question. Did you get to find an answer ?
And how does this affect billing given that there is a limit of 25 collection runs but unlimited flow executions on local.