Hi! This might not narrow things down, but for oud oils the best best, in my opinion, is to ask for a sample pack from one of the vendors you’ll find on the front page of this site.
Location (therefore shipping time and cost) can potentially narrow it down. Your profile says you’re in London so you could try emailing Habzoud or Oudbase about a sample pack that covers a range of regions and profiles. Lots of others in EU and further afield with decent shipping rates as well though.
Hope that helps.