Start with The Sims 4 if you are new to the series: its base game is free, and its building tools make it easy to get started. Choose The Sims 3 if an open world and fine control over colors matter more to you than a newer look.
IMVU is the easier starting point for outfit styling and quick chats. Choose Second Life if you want to walk through places, build things, and make a home in a wider virtual world. Try either free before you buy clothes, currency, or a paid plan.
Second Life is the strongest starting point for adults who want a broad social world with places to explore and things to build. Choose IMVU for outfits and chat, VRChat for lively shared spaces, Palia for gentle tasks, or Minecraft for building with friends you already know.
Choose Growing Together for infant milestones and family bonds across all ages. Choose Parenthood if you want more say in how kids behave, at a lower list price. Neither pack replaces the other.