The proposed mega-fight is expected to take place in Las Vegas on May 2.
Porter feels that Pacquiao has the weapons to beat the American in their much-anticipated fight.
"For me I think that [Manny] is the favourite because he is a little more versatile than Floyd at this point in his career,” Porter told Boxingscene.
"I think Floyd likes to use his defence and counter punch while Manny does a little bit of everything and does it from a southpaw position.
"That is a great fight and hopefully I get the winner," he added.
Mayweather is the 1/3 favourite with Coral Sports Betting to beat Pacquiao.