Besides the great characters, writing, emotions and all that stuff, there are two things that I can think of at the moment that I would choose UT over Trails. They would be the shorter length of the game and that it's a game I would give to a kid.
But onto Trails. I have the game and I've played a little until I had to reformat my computer. It is definitely a great game and I think my opinion of it would be even greater if I had the time to sink into it instead of playing trash like LoL and Warframe(excuse me).
I thought the game was a light novel because of all the text and it felt like one so I searched it up and instead I found out that the localization team went through hell translating it especially the second chapter.
I'm probably going to buy the second chapter to at least show my support.
Here's the link:
http://kotaku.com/the-curse-of-kiseki-how-one-of-japans-biggest-rpgs-bar-1740055631
Here's some tl;dr quotes:
"She estimates that the script clocked in at 716,401 words, which is roughly the size of 10 novels. For context: the entire
Lord of the Rings trilogy is 455,125 words. Tolstoy’s
War and Peace(New American Library Version) is 587,287."
"That March, Dice took a knife to his chest. He later wrote about the experience in
a blog post, explaining that he’d sunk into a cycle of depression and self-loathing triggered in part by his work on
Trails in the Sky SC. “A thousand, thousand failures haunt me,” he wrote. “Failures that caused others pain, discomfort, distress. Failures so many I can no longer count them all.” He's alive no worries.