DK can struggle against projectile characters and Link can camp DK with his projectiles, is easy to combo, and Ding Dong was nerfed in Ultimate.
My Vote Donkey Kong 4 / Link 6
Edited October 28 2020
Link also has spin attack to punish DK's moves and Donkey Kong's moves have less intangibility than in Smash 4 making it easier to for Link to fight DK and down tilt nerf helped Link.
DK can struggle against projectile characters and Link can camp DK with his projectiles, is easy to combo, and Ding Dong was nerfed in Ultimate.
My Vote Donkey Kong 4 / Link 6
Edited October 28 2020
Link also has spin attack to punish DK's moves and Donkey Kong's moves have less intangibility than in Smash 4 making it easier to for Link to fight DK and down tilt nerf helped Link.