Have you tried playing both of the games and couldn't tell what makes them different? They are not live casino games and the differences between the two are very clear, the major difference i see is their engagement level. I personally do not enjoy slot games because it does not demand for any additional skill or some interactions that keeps me engaged. Just relying on luck with no skill or strategy is boring to me. This is unlike crash games where you use your brain well to think ,analyse patterns and interact actively. Crash gives a sense of control which makes it very much engaging compared to slot games.