I like Chako slightly better than Korean Grill house (only SLIGHTLY), for several reasons:
1. It's newer. Despite Korean Grill House's recent renovations, Chako still looks newer and has a lot more space, so I don't feel so crowded.
2. If I go to Chako, I only go for the 'late night' menu because it's cheaper. That being said, I haven't gone for lunch so my review (obviously) excludes that. I wouldn't come here for lunch, anyway, having seen the prices. I know I'm likely to get better sushi elsewhere.
3. Their Korean barbecue menu also includes vegetables (where at KGH, they're an additional cost). I don't eat more than one round of the vegetables anyway (I'm there for the AYCE MEAT!) but it's nice to have the option.
The service at KGH exceeds that of Chako, I presume because it's a smaller setting. This shouldn't really be an excuse on Chako's part, but it's likely the reason. I can only really justify coming here past 10pm, otherwise I find their prices to be a little steep, considering I'm cooking my own food (I realize sushi's involved, but from the sounds of other reviews, it's not worth the extra money either). All in all, both places have their good & bad. At the end of the day, my decision is based pretty solely on what time it is.