Stock spark plugs vs NGK BKR7EIX iridium

Can anyone please advise me on the spark plus used and what quality they are in the 13 plate mk3 leons and onwards. ive got a 14 leon fr so its 3 years old. I'm planning on doing a remap and i been reading up on another thread on here suggesting to change the spark plugs to the NGK BKR7EIX iridium. ive read they are top spark plugs pretty much money can buy and should make the car more "livelier"
Can someone elaborate on what one could mean by that?
Just want to make sure its worth the money as my car is right now kinda feels sluggish and only sometimes it feels lively. does the spark plugs make the car feel like "lively" like this or in another kind a of way?

thanks

Thanks for replies. I think I’ll just replace it with these one when needed. But out of interest how often does it need doing? Cars 3 years old and can’t be sure it’s been done before I had it. Current mileage 31000 miles


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