Posca, I personally only recommend neutral colors. Like black/white/maybe navy... I LOVE alcohol markers. I love the gradient blended look that I can achieve with them. I have some copic but I really love my altenew alcohol markers, but they are quite pricey---I got mine on sale and it was still a splurge. just trying them out, I'd go for some cheaper ones, I went with altenew because of the refillability and that I can replace the nibs.
@mywisecrafts Could you show me some examples of how you used the copic markers with mixed media/art journaling?