I know Netflix has 5.1 audio. It might depend on what hardware you are using to stream. I have an older Sony blu ray player and they havn't updated the apps on it in 5 years, although everything still works. It will only play Netflix in 2.0. My Dad has a newer Sony blu ray player and the apps are up to date, and Netflix plays 5.1 audio.
That's the other thing the hardware companies self destruct their hardware by stopping to send you app updates. My blu ray player is perfectly fine, but they cut off my youtube app 4 years ago, and my Netflix and Amazon apps are really out of date now. So now I have to go buy a new blu ray player just to get the "free" apps for things I pay to subscribe too lol.
I finally cut off cable 4 months ago, I never watched it and I don't watch sports. The sports programming is usually half the cable bill, and it had big fees for "Sports Rebroadcasting" as well. I got a HD antenna and I can get 40 channels for free! I never knew I could get so many free channels. Then I pay for Netflix and Amazon, although Amazon mostly for the free shipping, I only watch 1-2 shows on Amazon. Netflix has more programming than I could ever watch so it's plenty for me. Then for certain shows that I really like but aren't on there I usually buy them on blu ray. I don't want to pay for a virtual media collection, you never know when these companies might go out of business or cut off your media access, then all the media you paid for is gone.
The only think that sucks now about Netflix is they don't have many current movies, other than the ones they create. I forget if you can still get DVD's by mail through Netflix if you have a streaming account or if you have to pay extra for that. Or are there other streaming apps to get current movies now?