Jimenez has made headlines for his impressive goalscoring feats in the Premier League, and is being linked with a summer move to Real Madrid.
Meanwhile, Vela has been excellent in Los Angeles in MLS recently.
"I think they [Vela and Jimenez] are the best," Pizarro told ESPN.
"In talent, everyone knows about Carlos Vela.
"I think it's between the two and it's even."