I have a friend who is a novice woodworker. He wants to make some Adirondack chairs for his son's wedding. The son is likely to die this year and I think making the chairs is to take his mind off it.
I recommended white oak, but it is rather more expensive than he wants. He asked about PT. I thought PT was unsuitable, as it warps, needs to be stained, the dust is toxic, and might not be durable when cut.
Any opinions on this would be appreciated.

I offered to help him, or at least let him use my tools, but he wants to do it entirely on his own.