In my experience, I have a preference for Indonesian sandalwood oils. They have a more woody-dry, earthy profile, with almost resinous nuances that remind me of pine. However, I agree with the general opinion that the nuances between sandalwood oils of different origins are quite subtle.
Even though I love sandalwood, I have a little frustration with the projection and longevity of sandalwood oils. I have to put my nose to my wrists to really smell the scent of the oil and it fades quite quickly, after 2-3 hours. Beyond this time, I only have a trace of the wood which remains for a very long time, but which no longer has the same projection force as at the beginning.
After reading this thread, I only have one desire: to add musk to the oud. Until now, I had intended to make several small macerations based on sandalwood musk with the small quantity of grains that I have, but since I discovered oud, this idea has only been running through my head, and your comments only make me want to 😛
I agree with some who find that sandalwood "overwhelms" the scent of musk. The difference is quite striking between a musk/sandalwood maceration and pure musk grains. The "animal" part, the many nuances of musk "disappear" with the sandalwood. It's quite fascinating, both sandalwood is not a very strong scent like oud, but it takes a lot of space on musk when combined with it.