This website helped me decide.
http://www.toyotaownersonline.com/parts-service/toyota_parts/spark_plugs.html
NGK spark plug is the best for Toyota, Honda and Nissan
To check the denso spark plugs compatibility with your 2006 Toyota Camry, I would suggest you refer to a garage or a Toyota dealership, in person or online. You always have the option to email them with any concern or information you have on your Camry. Your Toyota dealer is always in the know on their cars and which parts are best suited, even for older models: they remain their models.
Motorcraft Platinum Plugs.
You can do this on your own if you have any knowledge of cars. If not, a mechanic is the best way to go.
You have to use platinum-tipped spark plugs ONLY.
NGK laser iridium spark plugs.
the best spark plugs for all ford vehicles are the motorcraft type, which they come from ford.
The best spark plugs are the original equipment plugs that were installed by the manufacturer at the factory. Sometimes you may need to go to a dealer to get the exact plugs.
AC plugs
To change the spark plugs on a Vauxhall Zafira open the hood of the vehicle. The spark plugs will be located on the engine. It is best to used a spark plug removed to unscrew the plugs. They will be connected to a cable. Remove the cable. Replace the plugs with new ones and reattach the cable.
The front spark plugs are easy. To change the rear plugs the top mixing (plenum) chamber has to be removed. This involves removal of cables, electrical connectors, throttle body, vacuum hoses, & rear support brackets. Nasty job. Best left to a professional.
It is best to go with the factory used spark plugs. The factory uses champions.