Is it my streamer or does Audirvana sounds better?

Audirvana 3.0 is excellent. I've been able to compare it using a M1 MacBook Air to my souped up Wim Pro setup. Prefer the wired method where I can upsample to DSD 128 or 256 frankly but my system is very sensitive and can take advantage of this. 

I'm not surprised that this type of Mac setup with Audirvana is challenging stand alone streamers in systems. Audirvana has a very good isolation approach through the computer and it simply sounds great connected via USB to my RME ADI-2.

This DAC allows for an upsampled DSD stream which frankly delivers better sound in my system setup. YMMV. 

You are trying cheap entry-level streamers, whereas Audio Nirvana is a software-based solution. Two things are happening. One is that you haven't really heard a proper streamer. For example, in roughly that price range but significantly better would be the relatively unsung but German-made Lindemann LimeTree Bridge 2. But made significantly better with an MCRU linear power supply. Secondly, what you are hearing likely is Audio Nirvana's software-based capabilities. And they of course sound very good compared to the cheaper hardware that you're comparing it to. 

I just purchased the Matrix TT1 and it sounds very similar to my Mac with Audirvana. Not sure if I am ready to Move to a more expensive streamer for now.