Hello guys, i'm new to this website and was usually focussing on c# applications and simple web applications.

I was thinking about working on a web-based mulitplayer avatar chat like Imvu, second life and so on but I'm a little confused on if i should start the project using a game engine like unity or Unreal Engine or simply create it using JS React in combination with Three Fiber and socket.io since it should be canvas web-based.

Sidenote: The avatar chat should be 3D based. Would contain a simple Chat and avatar to move around specific rooms. And the avatar models should be able to change clothes etc.

What is your opinion on what to use to archive this?

I would appreciate any kind of suggestions.

Interactive three.JS based 3D Environment with Convai Characters

I suggest finding out what the core of this mulitplayer lmvu-like chat avatar would be, and then implement that with the tools you're most comfortable with. Scratch all the things that are not absolutely essential to making that avatar; if it comes down to a single, challenging task, you can take a crack at that first.

Later I'd consider porting it and adding other features.