alt Hacker NewsThat actually pretty much is the ELI5. Its merely a different terminal that offers more features than iTerm2 and also runs on OSX.
Unless you actually need/want those features (which, although I am a terminal aficionado, I must admit are niche as fuck), pick whichever terminal makes you happy. Features that are important to some people are performance, Unicode support, and OS support.
The most decidedly non-ELI5 feature comparison: https://www.jeffquast.com/post/state-of-terminal-emulation-2... and https://ucs-detect.readthedocs.io/results.html
You could argue whether or not it's a "feature", but one of the thing ghostty claims as an advantage is the out of the box configuration.
With no config at all, ghostty looks nicer than my alacritty setup. The rendering is just real nice. I could probably get alacritty to look as nice or nicer, but ghostty just worked this way with no config needed.
So you could consider aesthetics and rendering quality, and simplicity of setup both as features, which people may need/want (or not).