This is a great question. I'm not sure it's an either/or scenario. I have an #Alpha 6400 (a6400) and a #ZV-1 setup for livestreaming. I like that the Alpha 6400 (which I have set up at an angle to my computer) allows for interchangeable lenses (mine has a #Vario-Tessar T* FE 16-35mm F4 ZA OSS on it most of the time) and the ZV-1 is set up for head on. I run both through a capture card which has been very stable. I feel like this setup gives me a lot of versatility. A #ZV-E10 in place of the Alpha 6400 would also be a great solution, but since you already have the Alpha 6400 (like I did), you could keep it and add a ZV-1 and a lens or 2 to expand your setup'd versatility. Of course it depends on exactly what you're doing. You might also have a look at this video with Terry Warfield. (https://alphauniverse.com/stories/vlogging-tips-and-gear-with-terry-warfield/). He talks about gear like the ZV-E10 as well as some of his top vlogging tips.