When a paver driveway ruts under the tires or a pool deck develops a wave you can feel barefoot, the stones are rarely at fault. Concrete pavers, porcelain, and travertine are all more than strong enough for residential loads. What failed is underneath: base depth, compaction, or edge restraint.
Base depth is the first line item to check on any bid. A walkway can live on a shallower base than a driveway, and a driveway that sees a truck needs more again. Sandy Brevard soil does not do you any favors here, because it moves easily once water gets into it. If a bid does not state an excavation and base depth, you cannot compare it to anything.
Compaction is the second, and it is invisible by the time you see the finished job. Base has to go in and get compacted in lifts, not dumped to full depth and rolled once on top. Skipping that saves an afternoon and costs you a flat surface about two rainy seasons later.
Edge restraint is the third, and it is the cheapest of the three to do right. Without a restrained perimeter, the outer row creeps outward, joints open, sand washes out, and the field slowly unravels from its own edges. Polymeric joint sand and a proper restraint keep everything locked as a single surface.
None of this is exotic; it is what the paver manufacturers specify. But it is also exactly what disappears from a bid that comes in surprisingly low. When you compare quotes, compare those three numbers before you compare the total, and ask each contractor to write them down.