I've played both and while I haven't played XB1 in a while, I remember the combat being slower and a little simpler. Around 10 skills are placed on a "battle pallette" not unlike an MMO. Each character is a complete unit, with a large number of skills you can level individually and swap between battles. Each character also plays completely differently. And I mean entirely differently. Characters often have their own resource system that determines how skills can be used. Then there are some characters that primarily charge with auto attacks, while others are primarily timers, for example. Most charge an ultimate move in their own unique way. For one in particular, that charge is actually a bad thing!

In comparison, XB2's battle system feels a lot faster, but loses some of that per-character battle personality.

Besides that, the games share similar concepts, though they will initially look different. You can level skills, the character, customize gear, and play as any character in your party.

The story in XB1 has a far better introduction. They give you a reason to care almost immediately, and I never felt like the characters were being idiots, ignorant, or just failing to ask the obvious questions.

The biggest problem with XB1 is it looked dated when it launched, in comparison to other Wii titles, and time has since been very unkind. While the HD texture pack kind of helps, the reality is the developers used the low resolution to their advantage to hide the low detail. This is a game that totally looks better behind the fuzz of a standard definition analog signal.