TPS without use cases and idea is useless metric. Im not sure that it can tell you anything about the project
Im not sure about that because he was asking for the which the most scalable blockchain right now. It has nothing to do with usecase and it might be the different case.
The solana blockchain shoulod become the most scalable blockchain right now. It can perform up to 29k TPS in the latest test. Fieta is not the most scalable blockchain right now. You can check it solana blockchain dude.
I hope this will give you a small insight