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Depends on the vehicle. NGK on the four bangers on anything larger whatever they came with stock. Champion on the lawn equipment. Technically I guess I can't vote.
For the boat champion makes a marine plug- they are much better than the standard AC plugs the boat came with. Our boat has a 4.3 GM motor. These plugs increased our fuel economy by almost 8% on avg.
Just changed the Motorcraft plugs on my wife's 4.6, '96 Cougar. After over 90K miles they all looked good...the gap was bigger of course, but I was impressed. Needless to say, I put Motorcraft platinums back in it. I'll probably do the same thing when I change the plugs on my truck.
I use NGK in everything since 1975. I had this 71 cheby vega that burned oil and the NGK plugs would last about 3 weeks before I had to change out the #4 plug.