I don't think there is a scientifically reliable way to measure overall transaction throughput, especially if we want to include transactions on the Lightning Network in this total number. If you think about it, every transaction in a bitcoin block may represent millions and millions of transactions on layer two, so each bitcoin block may contain the economic activity of a big city or even a whole country. People who criticize bitcoin for being "too slow" don't seem to understand that decentralized settlement of transactions is more important than the number of transactions per second, this is why in the traditional financial system we have one FedWire and many-many PayPals. What is interesting is that FedWire is very slow, but it somehow can afford the settlement of billions of transactions made by payment networks. And who do you think is more important and has more power? Not who touches money first, but who decides last whom this money belongs to.