IMO, the best plug to use is NGK copper.
A common myth about platinum plugs is that they don't foul....this is simply untrue. In fact they foul more easily. On my 911 I switched from OEM NGKs to Bosch Platinums...I saw zero benefit and an increased fouling rate.
I agree that the multi-electrode, non-electrode, splitfire designs are gimmicks.
If you really want to maximize the potential of you plugs then "index" them. But doing this is tricky and benefits are small.
'85 380 SL (sold)
'85 Carrera Flatnose
'71 280 SL Signal Red/Cognac