I have a strong personal preference for a crawl space or a full basement (which you probably won't find) over a slab. As mentioned by other responders, a crawlspace gives you relatively easy access to the plumbing, hvac and electrical elements under the home. Should something go wrong with those systems requiring replacement in a slab home, your options are to live with it or plan to jackhammer away some of the slab--not a happy set of choices. Termites add another dimension to the question. On a slab you can look for termite evidence yourself fairly easily (providing you remember), but will have to act quickly if you see issues because the termites don't have very far to travel from the ground into the framing of your home. You are a whole lot less likely to routinely go into your crawl space to look for termite evidence, but if there is something going on, you have more time before they get to the wood in your home. What I hated in my last home, which was on slab, is how quickly my legs got tired from standing on a surface that was dead and unforgiving. Growing up, my family had a small hotel where we occasionally had conventions of dancers. The dancers always commented on how much they loved our place because they could dance all day without ever feeling tired (the dance floor was on a basement) compared to other places which had convention centers build on slab. I never understood what they were referring to until I owned a house on slab and had tired legs.