Former Manchester City, Southampton and Charlton Athletic striker Wright-Phillips, son of Gunners great Ian Wright, joined the Red Bulls in 2013 to play alongside Henry but is now a superstar in his own right says Marsch.
"Listen, this is not taking anything away from Thierry, and obviously Thierry's the biggest name to ever play here, and is one of the best players but I think Brad is emerging himself as the best Red Bull player, the best New York MetroStars player, or whatever you'd want to call it," he said.
"He's the best player to ever play here.
"I think he came here to play here with Thierry, and he's now the new Thierry – or he's re-written the books to be the new Thierry.
"We're really lucky to have him."
His efforts have lead New York to second place on the Eastern Conference table as they strive to win their first MLS Cup having clinched the Supporters' Shield (minor premiership) in 2015.
During his career with New York, he has scored 71 goals in MLS (including play-offs) in just over 110 outings, including a record-equalling 27 regular season goals in 2014.