In the Pacific Northwest, Douglas Fir/Larch and Hemlock are common species for typical framing type lumber. The characteristics of each are outlined below:
Douglas Fir/Larch: Excellent load bearing capacity coupled with light weight. Noted for its uniformly fine, straight grain; works well with machine or hand tools. Sapwood is white in color; heartwood is reddish brown.
Hemlock: Strong and workable, it nails and saws easily without splintering. It is generally pitch free. Typically off white in color, can be a reddish brown also. Can have an odd smell when wet, that goes away when dry. Stiffness and strength make it suitable for most framing applications. Tends to not be quite as stable as Doug Fir Larch in warm climates.