3S brushless whoops are perfect for outdoor flying. I would not recommend them for indoors, simply because they are way too overpowered for flying in confined spaces. If you want to fly indoors, I would strongly recommend to check out 1S brushless whoops instead.
The Tiny Leader is the first 3S capable brushless whoop. Definitely not your cheapest option out there but the frame is carbon fiber and plastic - pretty sturdy. The hoops can be swapped each on their own.
The Tiny Leader comes with a XT30 connector and you can power it with 1-3S. At least the ESC’s are specced for that - in reality you want to use 2S or 3S in order to use its full potential. Especially with the HD version you should go for 3S if you want to have some punch.
There are two different options regarding the camera. You can either get the version with a Caddx Micro F2 with 1200 TV lines that can be adjusted from 0° to 45°. Or you can get the HD option equipped with a Caddx Turtle V2 with 800TV lines and the possibility to record HD footage with your whoop - how awesome is that?
The video transmitter is switchable and outputs up to 600mW power - pretty impressive!