Can you help me decide between a foundation, slab on grade and crawlspace?

We certainly aren’t fans ofbasementswhen it's at all possible to avoid them, particularly if there is a risk ofhighwater tablesand if you arebuilding on or near a floodplain. A slab would for sure be the safest route, sincecrawlspacesalso invite the samerisks of water infiltration, and they add cost for very little benefit. Here is a page that cover that very topic, have a look -

Crawlspaces or Slab Foundations Better - which is Better for Cost and Durability?

平板的缺点是，你所有的管道都嵌在混凝土中，所以它不利于未来对厨房或浴室进行改造。但如果你正确地构建它，并预测你未来的需求，就应该不会有问题。

What you are proposing with a crawlspace seems to be a fairly expensive solution to a so far unidentified problem. So what went wrong with your parents slab to make you hesitant? Let us know, and maybe we can offer some advice to help alleviate your concerns. In the meantime, here are some potential problems and solutions that your parents or others may have had with a poorly constructed slab floor:

Don’t embed water and power lines directly in the concrete, put them in a conduit so if there is ever any need you can pull the wire through and replace it.

Don’t put ventilation ducting in the floor, tubes can be crushed when pouring concrete or corrode.

将井线套在垂瓦管道中，这样就可以拔出并更换井线。为了使今后的维修更加容易，我们看到建筑商安装了第二条水管，两条水管都包含在一块垂瓦内。这样，如果有一条管线因为任何原因而损坏，你就有一个备用管线，只需将它连接到房子的一侧和井口即可。

Be sure to have the slab designed by an engineer to avoid frost heave, shifting or cracking, and to make sure that thesoil conditions are appropriate for a slab

Make sure to install asufficient amount of insulationto avoid heat loss and increase comfort.

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