Which make, model is the best truck 12/24vt fridge?

If you want one that lasts, then anything Waeco 24volt.
I’ve had mine since about 2003, it’s had one cheap minor repair since then.

They’re a bit more expensive, but if you buy some cheap crap you only get what you pay for.

Ask your boss for a contribution, all trucks should come specced with a fridge nowadays anyway, (unless you work for a tight arsed outfit like I do.) An old employee bought me this fridge AND a microwave, depends how they look upon their drivers.