For showing rolls honestly I'd like both percentage and dice roll. When we crit a 20 flashes before us with a camera change. For non-criticals, It would be nice if we could see the dice roll without a camera change.

Examples
As Astarion swings a d20 shows up showing the roll (15)
When Tav fires and Eldritch Blast at advantage, show both d20s (18) (8)
When Gale tosses a spell at disadvantage, show both d20s (19) (2)
When an enemy rolls a spell save DC, please show the dice (14).
etc.