I use "incense cedar" fence boards for mediums. These are sold as a loss leader (about 1.50/piece) by the lumber yards. Bees seem to care a whit about the odor -- I have had new mediums attract swarms, over pine wood nucs. The incense cedar is brittle, light, marginally rot resistant, and gets "pecky heart rot" which leaves pockets in trees older than about 90 years.
Eastern Red Cedar is Juniperus virginiana in the Cupressaceae family. European "cedar" is Cedrus species in the Pinaceae family (include Deodar, Cedar of Lebanon, Atlas Cedar, etc). Western Red Cedar is Thuja plicata in the Cupressaceae, and most closely related to Arborvitae -Thuja occidentalis (northern whitecedar in the trade). Incense cedar is Calocedrus decurrens (recently changed from Libocedrus decurrens). I have never seen wood cut from "western Juniper" (typical tree in the Great Basin ranges), but OSU sponsors a "juniper commercialization project".
I point out the nomenclature because these woods are not especially closely related and specific effects and working properties are not shared. I believe some of the "cedar oils" are not the same among the species, for instance, you should not make gin from Western Junipers or the West Coast Cedars. Eastern Juniper makes fine Gin.
The fragrant oils in the western red cedar (and other woods) develop in the heart wood and is strongest in old growth. Most modern western wood is from young trees and has relatively little oil. Old Growth Western Red cedar has become nearly impossible to obtain-- it is used to create shake and shingle roofing.