You need to do a cost-benefit, risk-benefit analysis.
In other words, say you save $600 and it costs you $2500 vs $3100. If your new guy vanishes after a year, that $600 will look like a bad savings and you should have stuck with Haldane.
But if he's with you for the next 15 years, clearly it will have been well-worth it to use him rather than Haldane.
Somewhere between 1 year and 15 years there's a time point where if he leaves it would be a wash whether you go with him or Haldane.
Figuring out that point is your cost benefit analysis.
Determining how likely this guy is to head off into the sunset by that time point is your risk-benefit analysis.
I'm using a GC on my house that I know for at least 11 years. On the latest project he actually took out stuff he had put in for us years ago! The guy who does our sprinklers every spring and fall has been doing it since the fall of 1997. We dread when he retires because the other guys in the company aren't nearly as good.
So, that's how I would make my decision.
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