I don't think there's going to be any audible difference at all. The quality will depend on your streamer.
Having said that, reliable is better than not. My normal cable provider is fast/cheap and sometimes goes out for days at a time, so I also have T-mobile as a hot backup for work reasons. Except in the middle of failover I never even notice the change has happened. What I do notice is that I no longer have long stretches of time when my Internet is down.