I've got quite a few aspen, douglas fir, and ponderosa pine....never have counted them, but there is a bunch. I've noticed that the young ponderosa pine in the Colorado mountains grow fairly thick and bushy for the first 15 years or so. When they decide to become a tree they shoot up and become more of a crown tree. The douglas fir are almost opposite. They like a little more water and shade than the ponderosa, which makes them end up competing for sunlight in the wild. Around here, young doug firs tend to be thin and spindly. Older trees can spread out and develop a a thick set of lower branches as long as they are not competing for height with other trees.
It depends on your climate. If you have sandy well-drained soil with lots of sun I'd try some ponderosa pine. They do best on a sunny hillside and tolerate crowding very well. Young ones seem to thrive on being overcrowded until they are maybe 10 years old and 6 or 8 feet tall. This compensates for any lack of lower branches.

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