Both motors are great! I lean Mercury myself for performance reasons - and looks

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What does your local dealer servIce - both Yamaha and Mercury? And if you switch to the Mercury, how much is the cost of switching over the controls? Is that covered via insurance along with the motor replacement (if insurance says no initially, then I’d press them given the drastically different wait times)?
IF your dealership services both motors, and you can wrap the controls switch over into the insurance claim, I’d 100% switch to the Mercury 150. But if the dealership doesn’t service Mercury, and just the Yamaha’s, then I’d for sure stick with that.