An average audience of 13.1 million saw break dancer George Sampson win the ITV show, while 6.9 million watched actress Jodie Prenger win the role of Nancy in the West End musical Oliver! on the BBC One show, according to overnight figures.
Both shows were split into two shows and the BBC attracted an average of 5.1 million for the first one.
The early evening final of Britain's Got Talent -- which is presented by duo Ant & Dec -- drew in 11 million viewers, peaking with an audience of 13 million, with even more people switching on for the results, with the highest rating throughout the show reaching 13.7 million.
Viewers voted 14-year-old Sampson the winner, after he performed his routine under a shower of water on stage. He scoops �100,000 in prize money as well as a slot at this year's Royal Variety Performance in December.
He revealed afterwards that he had decided to change the music for his routine, just an hour before the curtain went up.
The dancer had originally been set to dance to a Bee Gee's track but chose Singing in the Rain instead.
"I wasn't sure about the choice of song and, about an hour beforehand, we changed it," he said. "I probably wouldn't have won if I'd done the Bee Gees."
Meanwhile, viewing figures peaked to 7.3 million for the BBC talent contest -- which is presented by Graham Norton -- in the later results show.
On hearing the result Prenger, 28, burst into tears and said she was "chuffed" to have been chosen by the voting public.
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