If you were going for Earthbound, you'd be happier with another RPG. So I'd go with Golden Sun. Quite possibly the best RPG on the GBA, if not any handheld. I promise you won't be disappointed.
In my opinion, you should pick up Yoshi's Island. Super Mario Bros. 3 and Golden Sun are really great games (I especially love Golden Sun), but I hold a lot of memories and nostalgia for Yoshi's Island. It was just an amazing game. The platforming was top notch, and it had a pretty good amount of content to go along with it. I just loved Yoshi's Island, and it still is one of my favorite GBA games. However, Golden Sun is also a really awesome RPG, so you'd probably enjoy either one of those. Super Mario Bros. 3 is great, but it is cheaper than the other two on the eShop.
I've never gotten a chance to play Golden Sun (looks fantastic tho ) but Yoshi's Island and Super Mario Bros 3 are great. I have just a bit more of a preference for Super Mario Bros 3 since it has a lot of my nostalgia attached to it. (We wont talk about how I couldn't beat world 3 when I was younger xD)
Yoshi's island has aged amazingly well and it's a fairly technical game. Once you finish playing it, you can then watch AGDQ runs of it and have your mind blown. To be fair though, I have never played Golden Sun so you'll have to take my opinion with a grain of salt.
) but Yoshi's Island and Super Mario Bros 3 are great. I have just a bit more of a preference for Super Mario Bros 3 since it has a lot of my nostalgia attached to it. (We wont talk about how I couldn't beat world 3 when I was younger xD)
To be fair though, I have never played Golden Sun so you'll have to take my opinion with a grain of salt.
