I've tried trichord and burson and played around with both. I have found after doing the same mods as I have done on both units, they are pretty much indistinguishable in terms of performance and sonics. Hence I have personally concluded that it is more to do with the power supply used (I'm using 12V car battery), capacitors (mainly vintage oil fills) and using TCXO 1ppm 11.2mhz oscillator chip.
In stock form, they differ slightly.. the burson is very clean and clear sounding. After changing the stock onboard Elna Silmics to Dubilier Nitrogol oil fill caps, the sound became less sharp/pinpoint clear but it added more 'glow' to the sound. I guess it is a personal preference and it might not measure as good as the stock unit but to me it sounds more natural/real
So I guess my point is, they are all 'good' and will improve things from the stock unit (especially after feeding the unit with external power), but it is just a matter of modding it to see if you can get it to sound different (and hopefully more suited to your tastes).