For me, that would be Secure CRT. I have yet to find a terminal emulator that matches its feature set. If you regularly manage hundreds of machines using various connection protocols (serial and ssh mostly in my case) It’s worth the $$$, and so far there hasn’t been any subscription nonsense. I liked using it at work so much I forked over the dough to have it at home.
None of the free alternatives do everything I need.
I’ll also mention a few iOS apps. One is Sun Surveyor. It’s an AR app that shows you the position of the sun, moon, and galactic center at any given time. The other would have to be Radarscope. It’s a weather radar app, but it’s a really good weather radar app.
My experience with ProTools and Cakewalk 20ish years ago came in handy. Other than that, there are some really nice youtube tutorials available.
One thing worth mentioning is their excellent customer support. I signed up for the trial period, but then life happened, and I contacted them an explained my case and they were more than willing to reset my trial period so I could have a proper go.
After buying it I had a support request and they were both helpful and quick to help me resolve the issue.