I bought Juice pro many years ago and use it daily on my phone and Tablet. I like how it gives my one click access to my handful of servers, and I liked the syncing between devices. I started using Termux last week and it seems like a decent alternative. The copy and paste is nicer on JuiceSSH, and I think it is more immune from getting disconnected if you switch to another app during a session.

I used JuiceSSH many years ago, had the Pro version when it was briefly free once. I've used Termux for years now and it seems better to me. You can set up ssh keys and aliases like usual, multihop works. I think I used to use Hacker's Keyboard but now I use AnySoftKeyboard since it had better alt layout support (e.g. Dvorak, Workman). I've got a row at the top with ctrl, tab, arrows, esc... It even works to do C-a, C-c, C-v in other apps. I'd recommend the combo. All available from F-Droid.

"I guess I'm asking for a "Convince me to try it" style review of juice" Notice this is about juicessh becoming unusable and no longer having any support. That should satisfy you.

Can I use that keyboard only with termux?

For me it's mostly that it just works and was very easy to set up when I first used it.

It has an SSH focused GUI which can be more convenient