As said above, if you can get them for free here, just download and try.
Watching gameplay videos of ds titles makes them look ugly sometimes, so it's best to try it on your console or emulator; for psp, I played it when it was the only AC available title for me, it left me with neutral memory (can't say I like it a lot but I didn't dislike it either), but if you have already played the more modern titles I think you will miss some QoL features especially when running and climbing things.