What we know is, that Aokiji fought Akainu for 10 days, with their DFs being equally matched, knowing Akainu's DF is arguably the most busted in terms of lethality. So Aokiji's cold and ice had to overcome the immense heat and corrosion of Akainu's magma before severily injuring him and covering his body with scars. Aokiji won't have that issue with Kizaru's light.
As it stands, Aokiji is portrayed as more important, having fought Akainu for the fleet admiral position and now being featured in the double spread along the likes of Dragon, Garling, the silhouette man, etc. So Oda plans more for him to come.