Prompt 1 & 2 were the best options for a /long/ time on iOS but both of them suffered from Panic not really going full-in on iOS development in my opinion. They are still old-school app developers who want to write something once and a call it done with minor little fixes after that. Most of the hot/popular ssh/mosh tools on iOS now (along with lots of other types of iOS apps) are constantly improving/being worked on. I'm going to have to add Blink to my list of terminal emulators to try out because I'm actively trying to move off Prompt 2. I have played with Termius but I really don't have a need for an SSH client on macOS, I'm very happy with iTerm, and there are other little things in Termius that annoy me/worked better in Prompt 2.