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I think emunand+a9lh is better if you have a faster+bigger SD card. Saving/loading streetpass/spotpass data will be faster (it takes 10 seconds on sysnand but 3 seconds on emunand for mario kart 7) and it will prolong the life of the NAND in the 3DS. It's very easy to replace the SD card, but good luck replacing the internal NAND.
Also, it's possible to switch NAND easily so if you want multiple regions, you can turn off your 3DS, switch SD with another one, then turn on your 3DS. Also, if you don't want other people to mess with your NAND, you can take out the SD card and the 3DS will not boot. (with a9lh anyway)
If something goes wrong and your 3DS does not work anymore, it's possible to decrypt your savedata without the 3DS.
The only real disadvantage is that you need an SD card inserted for things to work, but I wonder what is the purpose of using 3DS without an SD card? You need an SD card in order to change Home Menu layout/Home Menu theme/StreetPass/SpotPass/SD extradata/install games anyway...
Also, it's possible to switch NAND easily so if you want multiple regions, you can turn off your 3DS, switch SD with another one, then turn on your 3DS. Also, if you don't want other people to mess with your NAND, you can take out the SD card and the 3DS will not boot. (with a9lh anyway)
If something goes wrong and your 3DS does not work anymore, it's possible to decrypt your savedata without the 3DS.
The only real disadvantage is that you need an SD card inserted for things to work, but I wonder what is the purpose of using 3DS without an SD card? You need an SD card in order to change Home Menu layout/Home Menu theme/StreetPass/SpotPass/SD extradata/install games anyway...