Da2. Less power than dfr, but definitely sounds better. Better staging, overall preswntprese, width, depth, musicality. It's the chips being used. Dfr is k2m I believe, while Da2 is Q2C. As in not a mobile DAC. Suprised the crap out of me, expect for $80. But again, the battery drain. A former phone, on airplane mode, dead in about 7-8hrs. On the DFR, looking at double that time, easy. But,an Da2 sounded sweet, of you enjoy Sabre sound. Fell more in love with some more musical DACs. Unbalanced, the Es100 still sounds very good using LDAC. Don't know if I mentioned that part. Android 8.0 phones so runnknr LDAC. Definitely noticed a difference even agaisna APTX HD. The ES100 is more "musical" than the DFR. DFR has great treble sparkle, "detail", I like it, but staging is more intimate than Da2 and definitely more cold than es100. Es100 is more fun. AK vs Sabre sound. Also, DFR is a little light in the lower freq. Nothing missing, but wish there was more slam sith cwrtcer genres. Instruments sparkle beautifully, but as I said, it's a colder sound. Es100 is a good all arounder using LDAC, APTX HD a little less. But if not on LDAC, itsi definitely not in the same ballpark. Wired vs wireless detail retrieval not a fair comparison on general