Yesterday I set up
this Sony Xperia as my DAP for my TWS. My reasoning for using a cell; 1. Usually cell phone will have stronger antennas than DAPs. 2. The Sony sends in aptX Adaptive and LDAC. For Bluetooth purposes that is all that is important for a player, in terms of hardware influencing the sound. The rest of specs concern wired. My MTW4 and AVIOT TE~ZX1 sound excellent with the Sony. I won't turn the volume all the way as I'll do more damage to my hearing if I try it. In BT, the TWS influences most of the sound quality.
I have been using a HiBy M300, it has all the codecs and decent antennas. The Sony responds much better to touch and also has a memory card slot. For those of us who need many gigs of space, phones with memory slots are far and few. Also DAPs at any price, 90% do not have both codecs.
I need to A/B the Sony and M300 to decide which to keep. If I could get the Moondrop in time, I'd compare and consider keeping it out of the 3.