1. I usually use an inner voice to think, in general i am in an imaginary conversation with someone and we keep exchanging thoughts arguments and we either end up polishing the thought or some kind of a paradox.
2. I also use pictures, they are not high resolution like in real life but more like a dream, it helps me imagine things that i want to think about, like a gadget for my internal monologue
So i use them both but mostly i use my internal voice