Tough question. McDavids IQ is generational and with that comes the best decision making in the League in terms of passing. I would say McDavid more consistently chooses the right pass and right options, so his passing has a higher success rate and I think the stats reflect this.
On the other hand, Leon makes more spectacular passes. His highlight reel passes are unmatched whether it’s a blind seeing eye back hand sauce, or a rip from his own end to send McD on a breakaway. These are impressive passes that McDavid doesn’t really try. But with those highlight reel passes comes more trial and error than McDavid, as Leon is more prone to turnovers than McDavid.
It’s a bit of a coin toss, but I’m going with McD on this. I’ll give Leon the better shot and finishing ability though.