I have much more experience with Japanese. I started Japanese a year earlier than Chinese and studied them concurrently after that. I also studied abroad in Jap

I have much more experience with Japanese. I started Japanese a year earlier than Chinese and studied them concurrently after that. I also studied abroad in Japan for a year. I have also written/read/used Japanese considerably more. While I did concurrently speak/use Chinese often during that period, I found I had to put less effort into Chinese. (We're still talking 1000s of hours). Nowadays, I use Chinese much more frequently because my wife is Chinese and our language-of-communication is Chinese. We've been married for 6.5 years, so that certainly helped my Chinese ramp up and overtake my Japanese. However, in terms of scientific vocabulary, only until recently, my Japanese vocab was greater than my Chinese. I've been reading many more books and forcing myself to write more in Chinese to build up my skills. (Have a few random posts on my blog) It's amazing how important all aspects: listening/reading/writing/speaking are important to learning a language. :)