The battle continues between two chief executives and their ambitions to acquire the third-largest wireless carrier in the United States. SoftBank CEO Masayoshi Son and Dish chairman Charlie Ergen have taken shots at one another as they continue to fight for Sprint. Son previously claimed that Dish would ruin Sprint because it had no mobile experience, while Ergen said Sprint would be better off with a U.S. company that can speak English and not a foreign one like SoftBank.

At an event in Tokyo on Tuesday, Son noted that SoftBank has already made achievements with transfer speeds and signal quality, which could be applied to Sprint’s network in order to dramatically improve the carrier’s network. He also pointed out that SoftBank has extensive experience with TD-LTE spectrum, the same wireless technology Sprint would gain from its planned merger with Clearwire.

Because of this, Son maintains his stance and believes SoftBank’s $20.1 billion bid for Sprint is far more attractive than Dish’s $25.5 billion offer.