It depends on raw or cooked.

If both options are cooked and line up so

A Totato has the texture of a coooked potato with the flavor of a cooked tomato, I’m 100% down

Pomato though… Idk. I’m imaging a pomato sauce and I think it would just be mixed mashed potatoes and spaghetti ya know? Not repulsive, but not desirable.

And if we’re talking eating it raw? Totato without question. Rough texture sure, but I’d get through it .