I think percentages to hit are fine. As already said, players figure out AC's of creatures quite quickly anyway.
It also has the added benefit of letting people unfamiliar with DnD know how likely they are to hit.
Having to look at enemy animations to figure out what AC they have sounds cool in theory but will become tedious. At least for me.
Not to mention having to know how each animation looks like on different creature and the need to create those animations in the first place.
Plus, whenever I run DnD I tend to "highlight" AC by describing the enemy a bit more, particularly if it is not humanoid. That is absent from the video game, since all you are relying on is the player looking at a model and making the conclusion themselves.