I have a very silly primary reason for preferring the Kitty terminal - I configured it to look very minimalistic and compact. It doesn't even have the customary app titlebar at the top. The other benefit is that it's actually a lot faster to start up than Terminal.app when you first invoke it. I know iTerm2 is really well-liked, but to me, it gave the "Breakin' 2: Electric Boogaloo" vibes.