Out of those 4, my favorite by a good margin, is the UF YBF. The overall tuning is really good, with clear midrange and treble, well extended and airy highs, but no sibilance or shouty upper midrange (just shy of it IMO). Detail retrieval is very good for a single DD IEM, and texture abounds throughout the frequency range. The big caveat is that it has been a gamble regarding QC and consistency. I purchased the newest iteration, in the “white box”, that I think only comes with the beryllium coated driver. If you can buy from somewhere where you can return/exchange it easily, then I think it is completely worth it. I think the next best is the EA1, due to it’s affordable price, and the ability to modify it to deliver more bass if needed.