I've got them both. Years ago, I remember liking ADV's more but just thumbing through a few chapters side-by-side now I think I like the Yen version better.
>ADV>+slightly better titles>+seems to capture the original intent a bit better overall, though not always>-more localization (or just de-japanizing? uses "noodles" instead of "udon", etc)
>Yen>+dialogue reads more naturally>+Osaka talks like she's from the sticks>+typesetter actually made an effort>>5342
In one Tomo had cat, in the other, it's a hamster.