The Mojo is well liked. The Poly, not so much. It had absolutely craptacular firmware at launch, and you need to be running the latest for it to have a semblence of working. It also has a craptacular Wi-Fi chip, and even with the most current firmware, has random drops. I have a Hugo2Go setup, and get random drops on Wi-Fi with it as well. Main reason I went with the more expensive setup is the 2Go also has an Ethernet port, and that has been rock solid for me. I have switches in every room of the house, so it still works as a “transportable” headphone rig regardless of which room I am in.
For similar money to the Mojo+Poly, you could get a Raspberry Pi with one of the various analog hats, or just get one of the Audioquest Dragonflys to use as the DAC/pre-amp. If Wi-Fi is important to you, I would recommend an RPi4 (even just the 1GB version – you don’t need anything more for Roon Bridge to run) as it’s got a better Wi-Fi chip and the USB bus setup is also better. Then use RoPieee as your RPi OS and Bob’s your uncle… You can also still use the Dragonfly for your “on the go” requirement, abiet wired via a USB pigtail instead of wireless.