post and pier vs slab

[Carey]

Our house slab in Keaau town was poured in '73 & withstood both the '75 & '06 earthquakes with no cracks in the house, & one hairline crack in the carport... the concrete drive (no idea when poured, but not same pour look as house) has several cracks & one slight depression area (less than a foot dia), the old front walk no cracks, the ohana slab added in '01 has a couple of hairline cracks & the lanai poured last summer has a few hairline cracks... only the drive has any deviation (noted above) due to the cracks...

Each of the slabs has a different quality look to it, the front walk & house slab LOOK high quality, with a really fine finish, the ohana looks like a pre-teen assisted the pour, the drive & lanai look like a competent, but not master, worker did the finish on the pour...

So with anything, I do believe that the QUALITY of the workmanship has more to do with a lot of this, rather than the actual material used...

ADDED: House, carport & ohana slabs are without cut joints, the drive, walk & lanai do have expansion joints...cannot say that I have EVER seen expansion joints in a house slab pour