Haven't played TF yet, but from what you posted I'd say Xenoblade. Then again, these are my favorite Xenoblade songs.

Xenoblade:

Zanza https://www.youtube.com/watch?v=v6xQyJlt7EE

The Night Before the Decisive Battle https://www.youtube.com/watch?v=Ji1le94rDnI

Central Factory https://www.youtube.com/watch?v=D8kQhmnbzW0

I felt as if the second half of the game had more memorable music than the first half, even though the first half was great as well. :)

Definitely Xenoblade. Absolutely beautiful soundtrack.

Xenoblade

Two words: Mechanical. Rhythm.

And I guess engage the enemy, unfinished battle, you will know our names, the god slaying sword, prologue b, and the rest of 90+ tracks have something to do with my vote too :P

Hard, I would say Xenoblade.... but then I remember "Scorch 'N' Torch" form TF and I don´t know anymore. Both games have amazing ost.

I prefer Tropical Freeze's one because it feels more joyful.

I can't even pick, both are so amazing, but in such different ways.

Xenoblade perfectly captures the game's hybrid of sci-fi and fantasy, and expertly evokes so many different emotions.

Tropical Freeze, on the other hand, manages to create tracks that are both catchy and atmospheric at the same time, going beyond the usual upbeat themes of most platformers to deliver a score that hearkens back to the rich ambiance of the original DKC trilogy.

Tropical Freeze

Hiroyuki Sawano. This doesn't even begin to be an actual contest.

I do not like the DKC2R OST but the original DKC2 has the best soundtrack ever. Xenoblade has a very good JRPG soundtrack which I like much more than the OST of Xenoblade X.

Definitely Xenoblade. I bought my first Wii just for that game in 2012. Lel. Better late than never.