I have both games and backed both projects on Kickstarter. They are both excellent games, but they are each hitting different aspects of the JRPG genre.
Battle Chasers has standard turn-based combat;
Legrand Legacy has turn-based combat as well, but with the addition of button prompts akin to
Super Mario RPG or
Legend of Dragoon which allow your attacks to deal extra damage while also keeping you engaged in the combat more than the traditional turn-based mechanics in most JRPGs. Both have a priority system that can be used to control the order of battle through the use of Haste or Slow status effects, but
Battle Chasers uses it more prominently. Outside of combat,
Battle Chasers plays more like a
Diablo-light dungeon crawler while
Legrand Legacy feels more open like
Final Fantasy 8.
Battle Chasers has some minor crafting and puzzle-solving elements, while
Legrand Legacy has crafting, fishing, and character-recruiting / base-building akin to
Suikoden.
Legrand Legacy also has some army-vs-army battles in the same vein as
Suikoden as well.
All in all, both games are very well made and lots of fun to play if you're a JRPG fan. There really isn't a wrong answer on which one you should buy unless you have a particular preference for dungeon-crawling or base-building. I recommend picking them both up in the long run. While I'm giving somewhat of a non-answer, I hope my comparison helps you to make your own informed decision. One last thing worth noting, if you'd like to "try before you buy"
Legrand Legacy does offer a bare-bones alpha demo on
Game Jolt. Just be sure to delete the install and start the full game totally clean. Trying to transfer a save from the demo into the full game will give you problems.