In terms of money made directly off the scam it’s D-Lucky. If it’s based on who is the more dangerous and can lead their suckers to ruin it’s Chrissy.

D-Lucky from everything I’m seeing is just selling a one time experience. He’s not telling you that he’s going to be your mentor and he’ll you quit your job and gamble every day. Chrissy tries to make recurring income off of his suckers and provides them with strategies that will ultimately cost them a whole lot more than what one would spend during their one day with D-Lucky.

D-Lucky’s scam is far more sophisticated and he actually has people working with him (possibly including certain casinos not named MGM). Chrissy does this all on his own and is very primitive in terms of his presentation.

D-Lucky also appears to keep the money he’s making. Chrissy is a degenerate that loses most of it in the casino

You can make a case for either being the “bigger” scam…but first I think you’d have to define what “bigger” actually means.