I like having a basement so a raised foundation in what I would prefer, With an unfinished or partly unfinished basement retrofitting things is much easier than slab construction as is running all the mechanicals. It also gives you the option to finish the basement. Slabs are good where the water table is high they also tend to be cheaper. All this is not my area of expertise though, Abound where I live now most everything is built on a raised foundation and it is what I have more experience with. I mostly do work with energy efficiency