The controls are somewhat different. It’s one of the biggest improvements. With the circle pad you can control a beam, just like in The Sims 3 for XBOX 360 and PlayStation 3. If you point the beam on an object, Sim or animal and press A, a menu with all availible interactions shows up. With the L and R buttons, you can rotate te screen and with X and Y you can zoom in and out. These controls are very nice and very easy to play with.
Unlike The Sims 3 for Nintendo 3DS, you’ve got three savegames, so you can play with three different families or share the game with other people. If you play for example on savegame 1, you can’t visit the Sims in savegame 2, unfortunately, just like on the PC.