I choose V3 as my favourite one, but I deffinetly LOVE the new up-dated ones.
Some people say that Tamagotchis' are pets, and that pets shouldn't go to work and stuff, but Tamagotchis' are more of a companion than pet.
I'm not going agaisnt anyone, this is my opinion:
The more up-dated and new Tamagotchis are extremely good. The more up-dated, the better.
But the Tamagotchi V3 will probably always be my favourite version!!!
Best Wishes,
barky