In the commercial marine world - small commercial vessels, workboats, pilot boats, naval vessels, yachts etc, petrol is treated as being of a much higher risk than diesel. This is in terms of quantities carried, ventilation, drainage, ability to boundary cool, firefighting, gas detection, electrical safety.
There are other pro's and con's - price, availability, power to weight / size.
Engine hours - looking at the car world, diesels tend to last longer than petrols. I would say maintenance is more important than hours. A rebuild with OEM parts wouldn't concern me too much.
I've got a Pacific 22 and yes, it is noisy, smelly and slow but being the marine equivalent of a Toyota Hilux is one of its endearing qualities.