The problem is California would win it. Not our fault the most beautiful trees in the world call this home.
Still, I find something exquisite in the eastern hardwoods, beech in particular. The turning of color and dropping all the leaves is really gorgeous.
Also Douglass fir is nearly as large & long lived as redwood, tho less impressive in person.
I'm partial to the eastern half of the continent. Very high diversity of amazing hardwoods. I've never been to Texas, but the pictures I've seen of Post Oaks look amazing. Tulip trees (Liriodendron tulipifera) are stunning, across the whole region. An oak beech maple forest turning red in the temperate autumn is awe inspiring.
Man I like trees.
This blog post has some good pics. https://www.penick.net/digging/?p=83517