Will a wireless streamer add problems to a signal coming out of a computers USB output?

Optical connections are typically of lower quality than all the others. They are offered as a “just in case” option. They require a conversion to light…. Then back. Conversion is never a good thing. 
 

First choice would be AES, XLR… or SP/DIF. The safest bet is that the balanced connections will sound best… but technically you have to check.. The difference is unlikely to be so large as to need to loose sleep on. I have tried both in my system and couldn’t tell the difference… my manufacturer recommended balance… so I went with that.

Congradulations! Good move.
 

My streamer is the most expensive component in my system before (and equal) to my amp… well worth it. You can’t recover or reject what comes from the first piece in your audio chain. 

To get great sound quality you want a stand alone streamer connected to your audio system. Involve no computer directly. Great streamers come form Aurrender, Linn, and some other companies. Bluesound produced a good budget streamer.

‘’If not near your router you can plug in a wall wart wifi extender and then plug your streamer via Ethernet cable into it. I have a $150K system that sound extraordinary plugged in via an extender.