One difference I noticed:

Shortcat: “Shortcat leverages the Accessibility API used in macOS, used by VoiceOver and other screen readers, to be able to expose UI elements, menus, apps, and windows as a list for you to search through and action.”

Superkey: “[The] Seek [feature] uses Optical Character Recognition (OCR) to find your text, and there are currently some limitations to this. It has a particularly difficult time with certain shades of blue text on black background, small text, and text close to lines.”

I just tried both. I like how Superkey works better (ie: it points to what you're about to click) but it couldn't find a a LOT of text on the screen making it not very useful. I'm not sure if there's an issue on my end or what.

I'm thinking about doing something similar to highlight where Shortcat's about to click cause I do agree that it could be better in that aspect. The amount of elements Shortcat will be able to pick up will be far greater than an OCR-based solution though

So I’ve been using Shortcat for a couple of days and I changed my mind. I think it’s superior to Superkey in almost every way. But I do like how Superkey points to the target. It’d be a great feature to add. Thanks for your great work!