The difference between Kappo food and Kaiseki food is explained here. If you're looking for artistic presentation of the food served, you should go with Kaiseki. It's expensive but worth it. http://www.kappohana.com/kappo.html
In Osaka, try the following website for Kaiseki restaurants. https://theculturetrip.com/asia/japan/articles/osakas-top-5-kaiseki-restaurants/