as for your spark plugs every engine is different so just buy ones to suit your car, as for brand go for NGK preferably the iridium tipped ones as they last longer and maintain the cars performance for longer
True, multitip plugs are only there so they last a little longer, if you check plug gaps regually then there will be no need for multi tip plugs. You will also find that the best plugs on the market are only have single tips