Lewis Hamilton and Michael Schumacher are both tied for the most World Championships at 7 each. Hamilton does have 103 total wins, compared to Schumacher’s 91 wins.
Coming in 3rd we have Sebastian Vettel with 4 World Championship wins. Another noteworthy mention is of course Max Verstappen, who deprived Hamilton of an 8th World Championship win, and is expected to have a career similar to those of Hamilton and Schumacher.