I am now using my Teac UD501, connected to my MacBook Air, but using the headphone jack (ie wired). Compared to going direct from the MacBook through the headphone jack on the Mac, there is much less difference than either of these compared to wireless from the iPhone.
I use Tidal premium.
I could live with the MacBook Air with the headphone jack. There is cleaner and better bass and a bit more definition with the Teac, but it is essentially similar in character, whereas wireless through the iPhone is a bit crap.
I did wonder whether