Eh, they have their places. Multi-electrode and rare metal plugs can deliver improved spark performance and/or longer plug life with an engine / ignition system designed to use them - the redblock is just a fairly agricultural design and won't make much use of them.
To be honest, Bosch plugs aren't BAD either - NGK are just my personal preference in my cars. Volvo plugs are just rebadged Bosch ones, if I remember correctly my owners manuals have specified both Bosch part numbers for different engine / year combinations. Denso are alright too, but I don't know the Denso part number off by heart.
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