Welp, time to take action and make it quick (but long).
Attack: Kai. 55.5 Tons > Adams 18.84 Ton scaled feat. However, if his aura is activated, Adam takes the advantage depending on how many blows he absorbs.
Durability: Kai in physical terms, see attack. But if aura is activated, then the forcefields can be hard to take down, so Adam would have the advantage if he has aura activated.
Lifting Strength: Kai. M is better than Adams K.
Stamina: Supposedly Kai? I am not sure how much energy exactly Adam has as it never specifies, but assuming those were days, albeit he can get tired from his aura being broken, Kai has still fought even in the harsh environments for days, not breaking a sweat.
Range: Equal. They both have range going as high as dozens of meters.
Intelligence: Assuming Kai is at least an above average fighter thanks to commanding an army with no problem and being a skilled fighter (despite being rated as unknown), I guess he takes it. After all, Adam can be overconfident.
Experience: Kai, no contest. A 500 year old fighter compared to a 23 year old... legendary.
Abilities: Hard one. Both have similar abilities such as them being having Extrasensory Preception, Enhanced Senses, etc. Of coarse, Adam is with his Mid-Low Regenerationn and Aura to make forcefields plus a power boost for every attack he takes, and Kai is with his summons via Chi plus transmutation to turn people into chi when weakened and absorb them. Id say they are equal, as its real hard to decide.
Conclusion: Kai pretty much has a majority of the advantages, and should be able to try to do brute force on Adam before he could land a hit on him with absorbed power from Kai from his semblance. Thus, the winner is Kai, until someone can try to make an objection to that, which I would appreciate.