A difference in projected ticket sales of United States dollars 1.3 billion between the two bids helped lead the report to note "significantly higher" forecast revenue of USD14.3 billion from North Americans and USD 7.2 billion from Morocco.
But he also raised a prospect that some experts say poses the greatest threat to Doha's World Cup aspirations - shared hosting.
Infantino said that, if it were to be enlarged, "more teams means more stadiums, more venues, more hotels, more transportation".
The former England captain, who played for the Galaxy for six seasons and was awarded an MLS franchise in Miami earlier this year, said he had experienced the passion for the game in all three countries.
A request from Morocco 2026 to present their bid in front of the South American Football Confederation (CONMEBOL) has reportedly been refused by the governing body as Zimbabwe and Namibia became the latest African countries to claim they will vote for United 2026.
His statements were seen as prejudging the vote in a blatant partiality that casts doubt over FIFA's transparency.
"I think this United Bid is a very important message to the world because football is powerful; it can put together countries and the message of bringing all the three countries together is the future of football".
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However, Zimbabwe FA vice president Omega Sibanda told The Herald that they are yet to decide on who to back to host the 2016 Fifa World Cup.
"CONMEBOL made an interesting request.so we will have to look into it".
"Whether this is possible to be done only in Qatar, of course, is a question mark", Infantino acknowledged, adding Qatar was never formally asked to host a 48-team event alone.
Infantino defended his decision to consider a $25 billion offer from unnamed investors for two new tournaments - a revamped version of the Club World Cup and a global Nations League for national teams.
He said other investors have approached now it is known Federation Internationale de Football Association could enter a 12-year partnership with commercial interests to run the club event, and a global Nations League.
"I can not disclose (details) in that $25 billion", said Infantino who was not concerned about which country the investment originated from.
Morocco, the only other contender, solicited Riyadh's support a month ago and by then "we had given our word to the Americans", Turki Al Alshikh, head of the Saudi Sports Authority, said in an interview with Bloomberg TV in Zurich on Monday.
"I've seen how much the game has grown in the last 10 years and it's incredible to have happened so fast and changed in so many different ways", said Beckham.