Have them play a few rounds of each other's sport 1 on 1 style.
Pretty sure Renaldo never gets a basket in.
Maybe James doesn't kick one in either, but he has a better chance.
All other measures of strength, speed, stamina, leaps, equal to slightly James.
You could argue their close to equal overall.
Renaldo has the edge creatively, (other NBA greats are better than James here too)
James can solely take over a game whereas Renaldo won't get as many opportunities to do so but they are equal in competitiveness.
In summary, I give the edge to Kipchoge.