My experience with 4-AcO-DMT felt somewhere in between smoked DMT and mushrooms. I haven't done Ayahuasca. For me, mushrooms feel extremely dissociative, in fact the dissociative aspects basically always hits me more strongly than the pure psychedelic aspects. Of course, DMT feels very dissociative too, but only in a "you're on a huge dose of psychedelic" way, at least to me. When I say mushrooms feel dissociative, I mean I literally feel like I'm on a strong NMDA antagonist. I've yet to try another psychedelic that feels this way this intensely. As for comparison of visuals, I've seen a lot of people say that they can't tell the difference between high doses of mushrooms and DMT. I can't agree with this, they are extremely similar but I always notice subtle differences. How much that matters to you, however, is variable. It is mostly the level of dissociation and sensory experience that differs as opposed to the types of mystical states. Now, when it comes to 4-AcO-DMT, I think the main thing I'd have to say about it is that it feels very much like mushrooms, and I would much sooner compare the visuals to mushrooms than DMT, but it lacks that same full dissociative quality that mushrooms give me. In this regard, I find it more similar to DMT. A "clearer" head allows for deeper (lucid) thought patterns and less confusion, and more focus on the visions like with DMT rather than getting completely sucked into my own mind.
Additionally, at equipotent doses I find both mushrooms and 4-AcO-DMT to be more impressively visual than DMT, and the former moreso than the latter. However, my experience thus far has also shown DMT to have a higher ceiling dose than either of those in terms of psychedelic effects. Your mileage may vary, but for me I think I would probably choose 4-AcO-DMT if I wanted to stay in "reality", and DMT/Ayahuasca for an actual vision quest. Not that they both can't work for both, but that's my opinion.