England counterpart Eddie Jones, whose own side could have become No 1 with a win, was also pleased.
The event was created to show the England squad the level of the public's support of the team ahead of the World Cup in Japan starting next month, but also to showcase O2's commitment to growing rugby in the country, where it has introduced more than 30,000 people to touch rugby since 2013.
"Dan needed to play 10 because he has been coming off the bench and doing a great job when we've had (Gareth) Anscombe (who will miss the World Cup due to injury)", said Gatland.
Wales will now head into the World Cup as one of the favorites to win the title alongside rivals England, former world number one side New Zealand, as well as Ireland, South Africa, Australia, and France.
"If Ford is going to have a stint at nine in Japan, play him at nine before we get there".
Ruaridh McConnochie, who was a surprise choice for England's Rugby World Cup squad, will have to wait to make his debut after pulling out of the test with Wales in Cardiff on Saturday.
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They will have to cut down two more spots before the World Cup, but all the remaining players are expected to travel to Australia. Utah Jazz guard Donovan Mitchell led the U.S. with 13 points, while Khris Middleton added 12 on 5-of-7 shooting from the field.
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"It's nice for a day but we won't be shouting from the rooftops about it", said Gatland.
"I thought he played well and we were positive in the way we wanted to play", said Gatland.
"We still have a month before the World Cup".
Still, it took a yellow card against England wing Anthony Watson in the 31st minute for Wales to score a try. He sent a crosskick right to wing Josh Adams, Wales recycled, and his crosskick left to North was caught and scored from. The Rugby World Cup warm-up will go some way to deciding who is in contention for the starting XVs of each side.
And in his post-match interview, Biggar said: "Special thanks to JJ Williams for all his comments this week".