My favourite is number 2. Number 3 seems less moddable and too play intensive for me. I like sims as a relaxing side game I can do while multitasking. I also love my mods and sims 2 offers the best and a lot of them, and also the expansion packs.
Well i currently have Sims 1 complete collection, and i've actually also played Sims 2, but without expansion packs, except i deleted the whole game after and Installed Sims 3, which is definitely awesome