@koalalala that's really odd that they only suggest the Oncotype DX rather than EndoPredict. When deciding to test, I researched into both, including comparisons and both seemed to offer the same level of accuracy. EndoPredict, from memory, is slightly less 'broad' in what it tests for but the stats on its accuracy in determining chemo or not are still just as good.
I recently saw that EndoPredict has an amount of Medicare rebate with a very narrow criteria (this is a recent change) and it looks like, from googling, that OncotypeDX should too, but I can't find details on how much. Perhaps it qualifies for more rebate and this is also what your oncologist is considering.
I would definitely talk to your oncologist more about their reasons for their choice. I did my testing almost 4 years ago, so their may be new information now.
Wishing you all the best. The fact that they are recommending this test is a great sign, as it's not even an option for so many types of BC.