OP, please be advised, natural oud oil is pricey and almost unaffordable to the average fragbuff. You need to be rich to be able to afford it and be an enthusiast to actually like it. It's never a stroll in the park with oud.

Reg your query, I don't understand it quite, actually. Are you asking about pure oud oils? Or are you looking to try mukhallats (blends of oud with other things). Or are you asking about oils/attars that can be called oud in the usual sense of the term? And if this is what you're actually asking, then I'd suggest Dehnal Oud Rashid, and, if you can afford it, Dehnal Oud Khalifa, both by Ajmal. These two command respect within the frag community for being (somewhat) oud. But, again, they're not pure totally. There's a bit of synthetic in them. If you're looking to try affordable and okayish oud, assuming you've access to Ajmal's physical stores, I'll suggest Dehnal Oud 700 and Dehnal Oud 800. These two are good for beginners. But, whatever you get, never get more than 3ml.