Something to note, Most places that sell NGK sparkplugs for Ducati's gouge the .... out of pricing. I'm seeing $30-40ea but you can order directly from NGK for $16 ea and know for sure it's not a 'clone/knock off'.
As far as upgrades, you might be able to find an iridium plug(mabye). It's not necessarily"better" but they tend to last longer since the iridium is a more durable material with a higher melting point when creating a spark vs copper. If you were to pull your plugs now you would see the center electrode no longer has a sharp edge to it, it will be slightly rounded. It gets more rounded as time gos by and eventually creates a very large gap for the spark to jump across.