hello there. i own t+a dac 8, and i borrowed denafrip ares ii last week, for a week!
in short : the t+a has sweeter and warmer tone. everything else they are on par i guess?
the ares has to be on a linux platform to sound its best. so a friend provided an intel nuc. if i used my asus laptop to ares, it sounded bright and harsh. i didnt use specialized driver from denafrips at all, so it may not be a fair comparison to t+a dac 8, which on my system used a manufacturer's driver. using jriver, i cannot even change volume on windows, i have to change volume directly on the dac 8.
the ares is hard to use, the interface on the dac itself is kinda confusing. using intel nuc / linux os, the tonal balance felt neutral, crispy detail, good mid bass punch / attack, good stereo imaging. but i personally prefer a warmer tone. the dac 8 sounded more lush.
compared to food :
dac 8 is like eating a delicious dish just fresh out of the kitchen, with sinful ingredients, you name it, fat, butter, margarine...
ares is like eating healthy food from the fridge. sinful food are always more delicious, ya know. but if you prefer healthy food, i am sure you will like the ares. it is much cheaper as well. to me it sounded clinical.
ares = sounded digital. dac8 sounded analog.