I have had huge ups-and-downs with Xenoblade 2, but I'll go on my impulse of waifus, UNLIMITED ANIME, and the combo-heavy battle system to give it my nod.
Honestly, if I really thought about it, I would be picking Xenoblade 1 because it was such a perfect game for me when I played it. My creeping fear is that if I try to play it now, it would feel dull after all these years.
Xenoblade X was doomed from that start to being the follow-up to my Game of its Generation. The sprawling mess has so many rough edges that I had to push pass through. I grew to love it on its own terms, but the initial disappointment never faded completely.