Wezterm is my favourite because it's really configurable and supports ligatures. Konsole is also quite nice. Generally I'm in favour of using whichever one comes with your DE, or Wezterm if you use a WM.
Kitty is probably the most popular one, but I don't like it cause no ligature supportno acceleration it claims it has good font management, but fonts never worked properly in my experience.
Alacritty and Foot are also popular for their performance. Alacritty does have some stability issues though.
I've used GNOME's terminal, Konsole, kitty, st, cool-retro-term, Alacritty, foot, and Wezterm.
The things I want from a terminal emulator are:
Ligatures
Customisability
Icon support / good font management
High-ish performance
Wezterm is afaik the only one with all of those.
Konsole is actually a pretty good terminal emulator, its big downside is that it looks horribly out-of-place in anything other than Plasma. So as long as you stay on Plasma, Konsole is a good choice. If you ever move to a WM or something, I recommend foot or Wezterm.
Alacritty has some degree of customisability, Konsole has more, but either way it's nothing when compared to Wezterm. It is really fast though!
The thing that skews the duel in favour of Konsole for me is the ligature support. I use neovim for programming and we all know code ligatures are a godsend, so ligature support in the terminal is very much a thing that I want.
Haben wir uns nicht schon auf "Latschi-Tratschi" geeinigt?