I'm not sure if it's my favorite Nintendo handheld, but I liked the GBA a lot. I got the standard opaque purple one, which isn't much to look at, but it felt nice to hold. I actually got one before I got any games for it, so I spent a while just playing my GBC games on it while anticipating my first GBA game.
I feel like I missed out on a lot of the usually cited best GBA games. I never played the Metroids, Minish Cap, FFTA, Aria of Sorrow, Advance Wars, Fire Emblem, etc. Actually, most of my GBA games are ports or remakes, but I enjoyed those a lot and didn't have many of the originals anyway. My favorite originals, though, were Pokémon Emerald, Mario & Luigi, and Mother 3.
Actually, there was a good while where Mother 3 was my favorite game overall, and it's the only game I own two physical copies of; I have a completed save on each of them, and those playthroughs were before the game was properly translated. I mostly relied on guides and a very basic translation of some of the main dialogue.
I never got a Game Boy SP, but I did get a Game Boy Micro. Back in around 2007, I saved up my money for a long time and bought the
Mother 3 Deluxe Box, which came with a Mother 3 branded Game Boy Micro (and what would be my second copy of the game itself). The Game Boy Micro itself is really nice to look at and has a very nice screen with adjustable brightness. However, it's just a
little too small, which can make it somewhat awkward to play, but it's otherwise my favorite way to play GBA games. By then, the DS had been out for a few years, though, so it didn't see a whole lot of use from me.
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layout by Sofi.