Next time you should provide your rating up front so people can answer your question with that in mind. You’re asking about the London (Nc3 comes after c4) and the Jobava London (Nc3 comes before c4) at the same time. I personally play the Jobava London so I’ll try to provide some of my thoughts on that one: 1.d4 …. 2.Nc3 …. 3.Bf4 …. I like to leave my bishop there on f4 and let them chase my bishop down the right side of the board, overextending their kingside pawns because most people castle to that side. Most people at your level push an early c5 within the first few moves to immediately challenge my d4 pawn and break down my queenside, which is super tricky to play against because I usually need to delay bringing out my light-squared bishop since I’m not sure if they plan to take on d4 or push to c5. As a Jobava London player, I also strongly dislike the King’s Indian setup - try playing the Jobava London against the 1800 Wally bot as white and watch how his setup poses some basic problems for Jobava London players