Equal

If Zoro and Sanji put aside their differences they become a really formidable duo. Plus both can use Armament Haki which bypasses Logia devil fruit defenses. Kizaru’s only way to avoid getting destroyed is he keeps his distance but Zoro and Sanji are good at closing the gap. If they didn’t hold back and didn’t waste time bickering they’d likely crush Kizaru with enough effort

Kizaru high if he tries. He was equal to Luffy when he was messing around, and Luffy>= Zoro+Sanji.

Kizaru wasn't equal to Luffy, he was downright losing.

Luffy was equal. When he beat Kizaru he ran out of energy, causing a tie. After they were unable to move, Kizaru recovered first and then fed Luffy, showing us he wasn't really trying.

Luffy wasn't either. He states to Kizaru when they begin battling in G5 that he almost died from the barrier and he wasn't using any Advanced Haki against Kizaru. He used it once and Kizaru was knocked down for a while. Luffy then 2v1'd Saturn & Kizaru and was overpowering them.

Still, if it was Luffy>=Kizaru, Sanji and Zoro are still losing.

Zoro & Sanji, extreme diff.

^^It wasn't though. Luffy one-shot Kizaru once he used ACoC and later overpowered Kizaru & Saturn simultaneously though to give Kizaru some credit, he was mentally nerfed but Luffy was also severely injured since he almost died from Vegapunk's barrier.

Yeah we really don't know how hard either were trying, so I'm not going to try and argue a point that I can't prove.