Apart from dice that it outcome can easily be predicted slot on the other hand is unpredictable.
Eeeeeeeeeeeeeeeeemmmmm. What?
The dice and slots are statically predictable games, like i know, that on long term the chance to get "6" from dice is 1/6. The same story with slots. I don't know exact amount of slot machine images, but i know that probability will be ratio between all outcomes and binomial coefficient of needed outcome (like n/m where m is all outcomes)
So i can't get why OP think in that way.
He's talking about whether or not the game is provably fair.
For a lot of slots they are not provably fair but they are regulated by governments. So whether or not you trust that is up to you.
I definitely prefer dice because of this aspect. If a company wanted to rig a game it would be super easy for slots.