I have both. They are both good, but I feel like the LZ A6mini gives you more options for customizing the sound with the three filter sets, and that could be important depending on what you are looking for. Initially I went with the black "reference" filters on my A6mini, but then I revisited the red filters that reduce the treble, and tried out a bunch of different ear tips, and by going with some wide bore ear tips that aren't very long (they don't extend much beyond the end of the nozzle) I was able to rebalance the overall sound to my liking - good sub-bass with palpable impact, present but not overwhelming bass, non-recessed mids, detailed but not fatiguing highs. Blon BL03 has a lot fewer variables to play with (and with the short nozzle, you'll be more limited with regards to what tips you can try with it). I'll try to do a side-by-side with the two when I have some time. Any particular classical pieces you recommend I use to compare them?