Yes!! Fire Emblem Awakening is great on the 3ds! I like it a little better than Echoes because the story in Awakening blew me away.
I have had my Switch for about a year now. It is an awesome machine!! At first I just bought it for the fact that it came with 2 controllers so I could play games with my friends without buying another one like I would with a ps4 or xbox. Also, it is portable, so you could play high quality games on the go. There are tons of fun multi-player games, and single player games on it... especially now with smash bros. on there. When I first got it, I bought a few indie games, and Zelda: Breath of the Wild. I wasn't a huge Zelda fan, but lots of people were telling me to buy that game. It is probably the greatest game I have ever played. And you have lots of other games coming out like a new Fire Emblem, and a bunch of Final Fantasy games. I'd recommend getting one!