DIY wooden staircase: solid tread or collage?

[Heracles]

Here’s another one, which seems to assemble the parts differently and is closer to what I’ve seen in the wild:
https://www.rona.ca/en/product/premontex-stair-tread-oak-natural-finish-48-in-l-x-10-1-2-in-w-x-1-in-t-09-mcn48-16695005