I would think you wanted colourful and bright as your a food truck and want to stand out if your beside a park or beach.
I would say the purple truck would be considered more busy with all the movement and graphics.
The orange and blue feels more related to your brand (which I’m guess is more on the fun, happy side), its colour palate relates strongly to sweets/dessert, it would stand out easily in busy areas, has a very “summer” feel, it’s design elements contrast well with each other, the simpler look is much more inviting than the almost chaotic graphics of the purple one
Pink and purple are analogous colours while orange and blue are more complementary, while both are good color schemes depending on the situation. The analogous colours would give of a sense of stability while the complementary colours would give off more fun and excitement which I feel suits icecream and your brand better.
Purple would be good for a more high-class feeling place like a Italian gelato shop in my opinion
But it’s your truck just my opinion