Rashford – Pogba's club team-mate at Old Trafford – has become a key member for United and England, while the 23-year-old has been hailed for his off-field work to assist underprivileged children.
Pogba lauded the exciting duo in a Q&A session with United fans.
"They're two big, big, big talents. I think they are so young and so talented," Pogba said when asked about Mbappe and Rashford.
"They achieved so much for their young age. I think they are the present and the future of football."
Barcelona superstar Messi has won a record six Ballon d'Or awards, while Juventus foe Ronaldo has five to his name as the pair continue to shatter records amid debate as to who is the greatest of all time.
"It's a nice but trick question as there is no best for me," Pogba replied. "Two different players. They are two players who both bring joy to watch.
"Any people are going to have their own opinion of them, just two legends. Me, I would just say they are two legends and not one is better than the other one. Just two people that give us football players, or football lovers, joy to watch."