Matt0106
Dawn of a New Day
Don't let Fates' character designs misguide you. Intelligent Systems had pride at one point that they have since thrown away for the sake of pandering to horny teenagers.
An example: View attachment 164153
It's not going to represent the series very well. Every game before Fates had weapon durability. Weapons would get worn out and break after so many uses and you'd need to buy replacements with gold you earn.
Birthright is also, like Awakening, very straightforward and not the least bit complex. As in, there aren't varied mission objectives. In past games, and in Conquest, there are objectives like Defend where you need to defend against waves of enemies for a set number of turns. There were also things like Escape where you need to run to a certain spot to leave the map, and Seize where your Lord character needs to seize a throne or other specific space to end the map. Awakening and Birthright are just kill everything (rout) and defeat the boss.
I encourage you to either try one of the older games or pick up Conquest (once we have more to go on than word of mouth from people who played the Japanese version) at some point if you want an actual idea of what to expect.
There are difficulty settings, so you can ease your way into learning. But if you don't learn how to strategize, you'll never improve.
But if they are new and want to start fresh without changing difficulty, Birthright is a good choice. That's what I'm starting, even if I am getting all three. There isn't anything wrong with their choice