With their talent, wit and charm, the Swon Brothers won the hearts of America during their turn on the fourth season of NBC's The Voice.
But lately, Zach, 29, and Colton, 25, have been competing with each other – to win over the hearts of their female fans, that is. "We argue over which girl is flirting with who when we're signing autographs," says Zach. "It gets pretty intense." Adds Colton of their competitive spirit, "It's friendly, yet not so friendly!"
Trying to decide which Swon Brother you prefer? Check out the video above, where the guys, both single, ham it up for our cameras at their PEOPLE Country photo shoot. Then pick up the new issue of PEOPLE Country, on stands now, to hear each brother plead his case as to why he's the better catch (we still can't decide who wins!).