Linkin Park

Well, in principle, Linkin Park is probably Rapcore, right?
They're still far from being true Nu-Metal.

Hmm, judging by the definition of Nu-Metal - "Nu-Metal (from English new metal) is a subgenre of alternative metal that emerged in the mid-1990s.
It is a fusion of alternative metal and grunge with styles such as hardcore, industrial metal, rapcore, etc." Or "The grunge technique of 'calm-aggressive' is often used, meaning that in the verse, the music and vocals are calm, with great attention paid to the bass and vocals, and in the chorus, the vocals break into a scream, with heavy guitar riffs coming into play, although the opposite can also happen" or "Nu-metal/Rapcore
This genre was extremely popular in the first five to six years of the 21st century. It is a middle ground between nu-metal and rapcore. It has a softer sound than the classics and angry styles. The vocals contain a much higher percentage of hip-hop 'rapping,' usually inserted in the verses, but unlike pure rapcore, the usual vocals for the genre are also used. The most famous bands: Linkin Park (early), Limp Bizkit, P.O.D."

In principle, Linkin Park fits these definitions; they sing in this style, and they themselves said that their goal is to mix genres. But to call it pop music?)) Well, that's a stretch. There are some quite soft and calm songs on their latest album, but this seems to be an experiment, because in their previous albums, the music was heavier, and it's not necessary to scream in the choruses all the time.

And Rammstein's musicians are better than Linkin Park's.

In what way? Do they play heavier music? Well, that's just their genre; what do they have to do with it? I tried listening to Rammstein, but it didn't really appeal to me, plus the lyrics are quite provocative, to say the least, and I don't really want to listen to such songs even though I don't understand them.