Kiz vs Fuji is a good debate though...
It's an interesting matchup. Kizaru was tanky enough to withstand a slash to the face from Ray with a cut to the cheek, and his CQC + sword give him excellent odds at close range.
Fuji can use rubble and gravity attacks to shield himself from laser volleys and his observation hard counters Kizaru's clones, but his meteors won't be of help here.
I say Kizaru wins because the thing about Fuji is that I'm not sure if his gravity is strong enough to hard counter light.
Because at that level of gravitational intensity, wouldn't he just be straight up invincible? Same goes for BB.
On the other hand I think Fuji would do very well against Akainu. His sword's lethality and powerful observation would give him a good chance at landing critical hits, and his gravity could easily allow him to deflect, reflect or manipulate Sakazuki's magma projectiles.