So, Konsole shipped by default with KDE Plasma, my current Desktop Environment. While I don't have a problem with it, I am interested in what other people are using, because there very likely is something better out there.
Specifically I've seen talk of Kitty and Alacritty, although I've also read that the dev of Kitty is allegedly kind of a jerk, so I am specifically interested in how Konsole matches up to Alacritty in your experience, but other suggestions and general terminal emulator discussion are also welcome!
I started using Konsole because of the "Copy Input To" and Bookmark features years ago. Even when I run Gnome I stilll install Konsole...it sometimes takes a little tweaking to get it to obey the theme colors, but for my workflow it's worth it. I'd recommend determining your must have features for your work and start there.
As another example, on Windows, I was a heavy Putty user, mostly because when working with remote support, that's what they're familar with. I then had a need to export my putty saved sessions, it was then that I found out it was not possible. Kitty on the other hand had loads of QoL features like that. I still keep Putty portable around for the one off remote support user who is determmined to use only Putty, but my go to on Windows is Kitty
I migrated to Alacritty from Konsole. I use ANSI colors (for base16 terminal theme) and Konsole does not play nice. Before Alacritty, I tried Kitty and it had some problem with the font I want to use (PragmataPro I think). Wezterm is another terminal I tried as it uses lua for configuration. My general conclusion is 'Alacritty is the most bare bone, uses least memory and suits my need'.
For Windows, I used to use cmder in the past. I use Windows Terminal and Putty (for portability) nowadays.