Manna is my favorite Korean BBQ spot now, I don't go to Gen that often since their opening. I usually go with the AYCE plan with premium meats since the quality and meat varieties are so much better than the regular one.
Food: They gave you beef tongues generously, unlike Gen only gave us a few slides every order. The meats are really fresh and marbling.
Service: Good. We've been here for a few times and all of the servers were extremely nice, especially a Korean lady who are super helpful and nice.
Con: they don't offer drinks with refill. That's probably the only con I could think of.
Price: a little pricer that other places but I think it worths.