Well, as i'm primarily a biker, NGK's are pretty much my first choice whenever required and over 30+ years they've always served me well - even racing with daftly powerful engine set-ups ie. I've melted the electrodes off a nitrous bike and still managed to ride home from Stratford to Camberley - how it was sparking is a mystery, but it was! I've used Champions in my Cooper 'S' and had Bosch plugs in my first RS2 back in the day, so its sort of whatever you fancy - just don't buy cheap - there are a few NGK fakes around, so buy from reliable source!