Every PSP I own must have the following games ready to go at any time:
-Lumines
-Rock Band Unplugged
-Patapon 2
-WipEout Pulse
-Final Fantasy: Crystal Defenders (gorgeous small tower defense game, but with enough strategy behind it for hours of play)
I acquired my 3DS before the first price drop and unfortunately I never really appreciated it while I had it. It was the first place I played Ocarina of Time, which was a really fantastic experience that I was probably too young to really appreciate at the time. I never got around to playing A Link Between Worlds unfortunately. Beyond that my other favourite was Mario Kart 7. There are a lot of games that I now wish I had picked up but didn’t get a chance to.
The 3DS is also really interesting as it’s currently the last Nintendo handheld that can fit in a pocket. That era of portable consoles has largely passed out of favour (this is why I’ve started collecting PSP Go consoles). A lot of the best 3DS games have been somewhat overshadowed by the Switch now. I feel like its game library may be remembered similarly to the Game Boy Advance, more iterating on older franchises rather than having its own hugely impressive identity.