I have lived in both slab and raised floor houses. There are advantages on both types as well as disavantages.
Raised floor: More comfortable, room under house to fix any HVAC or plumbling problems. Improvements to flooring easier. Downside: Can collect water and insects/pest.
Slab floor: Cheaper, no steps into house, and plumbing sealed. Downside: Floors are harder, if plumbling leaks, (it has happen twice to me), costly leak detection and repair. This is the main nightmare with a slab floor.