Destiny, they are fascinating countries and my suggestion is to visit both. But if I had to chose only one then my answer would be Japan. I am just very interested in Japan, its culture and people. Sorry can't give you more details on it though because I did not go there yet 
My parents go to Europe on a yearly bases but in 2005 they have decided to visit Asia. They went on a month long trip of Japan, China, Myanmar, Thailand and Vietnam. When they came back they were simply amazed of what they have seen. There were some restrictions in Myanmar (and my mom was scared) but everything went smooth and in terms of architecture they liked it the most. Don't even think about being mugged as the possibility is very remote. Your chances are much higher when you visit NY, Miami or any other big US city. IMO you can and should visit any authentic (out-of-the-way) place you want otherwise you will not be able to learn about the country and its people to its fullest. My parents mentioned that people were wonderful in every country they have visited. Very friendly and helpful. Yes, they've had some language barrier (especially in mainland China) but it wasn't a major problem. In Japan they did not have any problems at all as many people speak fluent English.
As for "red meat smell" it's a myth. Yes, there are some questionable articles about this but they are just rumours. Japanese might think that we still live in stone age and they might be right about that. My father called my from Tokyo and said that he feels that he is about 300 years in the future.
So when are you going to post about your trip to Japan or China?
"Reality is merely an illusion, albeit a very persistent one." - Albert Einstein
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