Prior to visiting Kintori, I have only had skewers/yakitori at Zakkushi so this review will kind of be relative to my experience at Zakkushi.
I think Kintori has some specific items that they do better, especially for chicken: skin (not available at Zakkushi), wing, gizzard, cartilage etc. I also liked the pork intestine better here.
The meatballs were also surprisingly tasty! I'm not usually a fan, but my boyfriend's sister wanted to try it and we ended up ordering seconds.
I personally didn't like the non-yakitori items as much. I found the rice balls to be too bland and their Kimchi bun was not very good (though I just checked and I no longer see it on the menu). We ordered takoyaki, but they brought out takowasabi instead which was decent. I also got the Chiki Chiki Don which was good, but I still prefer Zakkushi's.
Overall, an enjoyable experience!