I would love to see this as an Ask HN.
Rationally I would never pick somebody from the same field as me.
seeing people dying and suffering will change you, especially the young ones. a lot of those stories is not something you actually want to listen to after hard day at work...
Speak for yourself..
It gets boring even when your occupations are so alien to each other, that there's little you can share beyond bog-standard office gossip.
My fiance works in a t-shirt printing shop and I work as a developer. I enjoy hearing about his work, he enjoys hearing about mine but we know neither of us could do what the other does.