SPARK PLUGS....WHICH R BEST?

[TrisVVT]

Own a 2006 Megane cc 1.6VVT. Doing own servicing/maintenance on the car as we speak, but unsure what SPARK PLUGS ARE BEST! NGK plugs seem to be highly spoken of, but when at Halfords I decided to go for Bosch Super 4 which were only £3.50 more than NGK's, but have 4 thin ground electrodes apposed to 1 and claim: ◾Noticeably improved acceleration
◾Significantly smoother engine running
◾Superior engine elasticity
◾Factory pre-gapped electrodes
◾Higher ignition reliability thanks to eight possible ignition gaps
◾Self-cleaning thanks to surface air-gap technology
◾Increased thermal range: up to three times as many cold starts possible as with conventional spark plugs
◾Increased environmental protection and protection for the catalytic converter

Has anyone out there used these plugs before? What were the results? Advice appreciated.

[Megane II]

NGK Iridium.