We actually tried Optimism first! They announced in early 2021 that they would be ready in late March, so having launched in February, we spent all of March preparing to deploy on Optimism’s L2. We were ready to go — then they announced a delay until July, so we checked out Arbitrum. Our founding CTO, Alexander Schlindwein, found Arbitrum’s solutions to various technical problems superior to Optimism, and he was glad we switched, having seen both canonical ETH L2s up close. (And he won 3 of the largest bug bounties in the history of Ethereum, so I tend to trust his judgment on such things).