Over here there are at least three Qualities:
-) standard laminated
-) laminated with wateresistant glue-layers
-) planes sealed with waterproof (black-brown) layers (though all edges will still be unsealed)
A interesting alternative might be Wood-Plastic-Composites. But the only easily available forms are small terrace boards, not large, homogenous panels. Furthermore these are intended to be usede as they are. Varnishing them would be difficult due to the used resin. And they seem to be offered typically in wood colours.