Happy Vega + Hilo (+ DA11) owner here!
I also bought Taurus mkII for fun, as a 2nd amp...
However I don't use my LCD-3 anymore, just LCD-X (and even HE-6 with Taurus).
I haven't listened to Hilo since I bought the Vega.
From my initial notes comparing the two DACs Hilo is a little bit more "blunt", in your face, more 2D.
Vega is more refined, maybe a little bit "thinner" sounding, builds a room with layers of details that you can listen to, but only if you want to. Vega is more 3D, has a wider soundstage, and has a more dynamic bass.
I prefer Taurus over my BHA-1, at least for headphones. As a preamp BHA-1 may be more transparent, hard to test with all switching of XLR cables...
I don't think Taurus has less treble than BHA-1, maybe Taurus has a little bit "fuller" sound though. I haven't compared the two amps that much.
Taurus has a sharper treble with more sibilance than my Bakoon HPA-21, my 1st amp. However Taurus is a very good amp, I can even listen to HE-6 with it, at least when adding some eq...
In the beginning I had problems with Vega having drop-outs with the clock set to exact. After trimming my old laptop for music I almost never have a drop-out, it mostly happens when changing sampling frequency. You should always use the exact clock mode. One of the best things with Vega (as well as with HPA-21) is that it sounds so good with ordinary 16/44 material.