>>715380292If you enjoyed doing stupid grinding in Awakening, Normal mode lets you do that. It's what I did to max out every character's skill rank to S+. When you do New Game Plus, you can spend Renown to unlock class skills and ranks you've achieved previously. Hard is balanced and will take longer to do (can't grind infinitely but eventually you'll get good enough)
For the route choice, I do these recommendations, it's either between Blue Lions and Golden Deer.
Blue Lions has a straight forward focus on just your characters and the main war at hand.
Golden Deer delves into the actually history of the world and goes beyond the main war.
All routes basically cover same stuff during first half. Then you probably know about Black Eagles stuff but: It has a split choice. Default is mostly the same as the second half of Golden Deer but with a different final boss, this was the story that was originally written. And there's an alternate route which is the shortest of all of them, gives it a "DLC" feeling.
If the routes were shorter and better handled with pacing, I'd say Blue Lions then Golden Deer, but if you're not in the mood to play a 60+ hour thing more than once, go Golden Deer.