which of these three protocols would be the best?
The tried and tested holds up extremely well. The excellent choice made for Monero is still evident today as researchers and developers strive for the best possible technology. The tried and tested signature rings are replaced by a tree that represents all eNotes (TXO/UTXO). The Monero engineers were ready to stop work on an already half-built Seraphis as FCMPS turned out to have advantages or more elegant solutions. I don't think you are asking why Pepsi is better than CocaCola, but that the answer is objective and a lot of research time and consideration of all possible technical solutions, designs and architectures has been invested. What is certain is that the Monero blockchain has amassed an unsurpassed eNotes past collection since 2014 and is rightly the most widely used solution for private, uncensorable and decentralized money-wealth transactions to date. Finally, one should not forget that most centrally operated exchange offices no longer offer XMR and that a Rust wallet is under development. You always have to look at the whole picture, and no solution is as developed and widespread as Monero.