In the books Dayne was said to be the Jordan of fighters. And the show did a real good job of capturing that. The way he moved...the skill and methodology he showed to take down everyone just showed he was on another level

We’ve seen Jaime, Brienne and the Hound fight and Dayne still looked like an Olympian in comparison. Then the sword he used is basically the GOAT weapon. Jaime was said to be like a young Kobe. A prodigy. He was 15 destroying grown men. Now his skills may have atrophied as the standard of fighters in the Kingsguard worsened over time and there were little battles and fights for him to harden his skill set so I don’t think Jaime grew as good as he had the potential to be. Ultimately he was a step or two behind Dayne. I could see him doing something dirty to beat him though. Barristan as an old man could take out 98% of fighters. Barristan in his prime is better than every fighter not named Dayne and even then on the right day if Barristan was young he would’ve gave Dayne a serious run for his money. Barristan takes Jaime. The Hound and Gregor are just brawn. Stronger and bigger than everyone. Against someone that’s strong enough to counter their strength, skilled enough to not cower against their brutality and smart enough to strategize (Oberon for example) and take advantage of the right opening, they’d fall. Robert was pure rage. Strong as the Cleganes, about the same size give or take a few inches but still fast enough to keep up with the Daynes, Jaimes and the Barristans. He wasn’t as skilled as they were and would lose most of the time vs fighters at that skill level but wielding that big ass axe he only needed to be right once

I’d put Robert above the Cleganes though due to him having better speed and quickness while having similar strength. Plus the margin of error you have having to find the weak points in his armor with your sword vs him just needing to land one hit to your jaw or your chest to fukk your life all the way up. Only the GOAT swordsmen could neutralize that imo. I’d put Oberon right underneath Jaime and Robert but above the Cleganes. He should’ve won the fight. He just got stupid. Brienne is basically Robert in terms of size and strength if you want to imagine how Robert was supposed to be. Only difference is she is a great swordsman whereas Robert used an axe but as tall/fast/strong/ferocious as she is, that’s what Robert was written to be like

Imagine Brienne with an axe

Brienne Id put above the Cleganes as she has enough power and strength to counter them while being a smarter and more deliberate fighter. But she don’t past the eye test to be at the GOAT level. She’d still murk basically everyone except five people in the whole ASOIAF universe so

But to be perfectly honest I’m basing that on the show. In the books she didn’t fight the Hound and while Jaime does say she’s the real deal, Jaime still held her off despite being starved for days. They pumped her up a bit on screen.