It depends. All three Xenoblade games excell at some things... and are lacking in some other areas. However, the most balanced of them all is the first Xenoblade Chronicles. And knowing that the Definitive Edition will most likely fix some of its weakest areas (visuals is already a given), I think that this version will become clearly the best Xeno Chronicles of them all.
Been a while since I sunk my teeth into a new JRPG. This might have to be the one. Thanks.