Roy Jones Jr. -- Draymond Would Beat Up LeBron ... 'He's More of a Fighter'

Roy Jones Jr. isn't just a great boxer -- but he's also a pretty knowledgeable fight analyst ... so, we had to ask ... who would win in a Draymond Green vs. LeBron James throwdown??

You gotta watch the clip ... Jones essentially says that while LeBron is clearly the superior athlete, Green's got way more heart.

"He's got more fight in him."

Jones also says it's LeBron's own damn fault he got hit in the nuts for dangling his berries so close to a guy who has a reputation for being a ball socker.