I use both, but in my case it's mostly a matter of location; if I'm at work, I watch on my desktop, and if I'm at home, I watch on my TV via Roku. I don't really take full advantage of the capabilities because I almost always watch live (so no rewind/FF). I do get occasional playback errors on my Roku that require restarting the stream (part of why I only use "join live"), but I always assumed that was due to my slow home internet. I love having the option to watch on multiple devices and locations, though (including my phone on rare occasions)!
I rarely watch the away feed, and I've only noticed the absence consistently when the Sabres play other NY teams.