Ok let's cut the bullshit and set the law in stone.
Throughout Dragonball Super, during Goku and Vegeta's training with Whis, the fundamentals behind Whis' training was to enable them to have their bodies automatically move before they start to think, the key principle of Ultra Instinct. Whis repeatedly asserted that being able to grasp it, let alone master it, would provide the user an innate advantage in combat over an opponent. In the manga, it is described as the absolute peak of martial arts, and mastering the technique would allow the user to take on any enemy.
This technique was constantly portrayed as literally the most difficult technique to master, even among the Gods of Destruction. Beerus, who trained with Whis for a million years, failed to master Ultra Instinct by himself. When Goku achieved UI Omen, this was enough to strike fear on all the Destroyers, as they could not believe that a mere mortal could access that technique when they couldn't even master it themselves. Beerus himself pretty much shit his pants when Goku ascended to UI Omen, and gave Goku respect during Goku's fight against Moro, noting that Goku's fighting style while in MUI is angelic and perfect.
In contrast, Ultra Ego is significantly easier to grasp. While it provides the user with the Power of Destruction, Goku himself showed that he does not even need to use Ultra Ego to access Destruction, as during the Black Arc, he employed Hakai to nearly erased Fused Zamasu from existence. Ironically, Goku's feat of Hakai pretty much outclasses whatever Vegeta has shown with the technique, despite the fact that Goku does not know Ultra Ego himself.
There is a reason why mastery of Ultra Instinct is wielded by the strongest beings in the mythos, such as the Angels and the Grand Priest, while users who mastered Ultra Ego and the Power of Destruction such as the Gods of Destruction completely pale in comparison to them.
Put it in perspective: When Beerus participated in the Zen Exhibition Match and held his own against multiple Destroyers at once, was it attributed to his mastery of Ultra Ego, or his ability to use Ultra Instinct? The fact that Ultra Instinct, even if it's imperfect, kept Beerus in the game against overwhelming odds, all the more proves the technique's superiority over Ultra Ego, despite the fact that Beerus mastered Ultra Ego and did not master Ultra Instinct.
Lots of fans love to use Beerus' feat during the Exhibition Match to prove his power, but fail to realise that the very same feat also proves why Ultra Instinct, even if imperfect, is leaps and bounds superior to Ultra Ego.
One common misconception people have is MUI Goku's showing against Granolah, and Granolah's victory is legitimate because MUI should have 'saved' Goku from being caught off guard by the pressure point attack. What people fail to realise is that MUI only helps the user automatically react to threats. The difference is that Goku did not even know that the threat existed until the attack pierced his heart. Goku had no clue that Granolah was concealing his true body, so how can Goku automatically react to a threat that he did not know exist in the first place?
Ultra Instinct is factually superior to Ultra Ego. To deny this fact is to deny whatever teachings Whis taught to Goku and Vegeta during their training. The fact that Vegeta chose to abandon learning Ultra Instinct, and learn Ultra Ego instead cemented his clear and decisive inferiority to Goku.
And if we make this a Goku vs Vegeta matchup, this does not even factor in the fact that Goku mastered Ultra Instinct, while Vegeta's mastery of Ultra Ego is not perfect. It does not take much for one to understand that the fighter who mastered the superior technique is obviously much better than the fighter who has yet to master the inferior technique.
Of course, people are going to claim that Goku is a 'novice' with Ultra Instinct based on his performance against Whis, but overlooked that it is in the context of the accuracy of an already perfected ultra instinct. You can't possibly argue that Goku is a novice with the technique when its contradicted by the fact that he mastered the technique. The real novice of the technique is Beerus.
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