I would take the EX5 just for the convenience of having control remote, xlr out (really nice for monitors) and the Bluetooth, I mean is about 60-80 bucks, and if you really need something more budget there is stuff like schiit stack and zen dac v2
I'm in love with the form factor and remote control, even if is just 1w @ 32ohm (well controlled), i don't care even if I have already the atom stack (which is twice power after 32ohm), should I even care for the XA-10?
I see... at this point I just got stuck between Hiby FC3 (still possible the use of hiby app) and the 5K since this 2 have in-line mic support, but in my head the 5K sounds like the less headache device
I'm interested on how things like PC38X/PC37X could scale with something like the Onyx, but with stuff like Qudelix 5K having TRRS 3.5mm with in-line mic support, dual ESS DAC, balanced output and costing half the price, bluetooth (with LDAC and APTX Adaptive) is even worth considering.