Per research across companies, both help, screenshots are worse, but marginally.
The computer use stuff gets me fired up enough that I end up always sharing this, even though when delivered concisely without breaking NDAs, it can sound like a hot take:
The whole thing is a dead end.
I saw internal work at a FAANG on this for years, and even in the case where the demo is cooked up to "get everything right", intentionally, to figure out the value of investing in chasing this further...its undesirable, for design reasons.
It's easy to imagine being wow'd by the computer doing something itself, but when its us, its a boring and slow way to get things done thats scary to watch.
Even with the stilted 100% success rate, our meatbrains cheerily emulated knowing its I humbly and strongly suggest to anyone interested in this space to work towards CLI versions of this concept. Now, you're nonblocking, are in a more "native" environment for the LLM, and are much cheaper.
If that sounds regressive and hardheaded, Microsoft, in particular, has plenty of research on this subject, and there's a good amount from diverse sources.
Note the 20%-40% success rates they report, then, note that completing a full task successfully represents a product series of 20%-40%. To get an intuition for how this affects the design experience, think how annoying it is to have to repeat a question because Siri/Assistant/whatever voice assistant don't understand it, and they have roughly ~5 errors per 100 words.