Of course you do. They track both Nintendo systems lower. Actual sales numbers are most likely somewhere in between. One isn't more accurate than the other though.
You say that like I have a grudge against Nintendo doing well? I like Media Create more because I believe they are the most accurate source for gathering sales data from Japan. They don't favor any console, hence MC recorded the PS3 reaching 1mil in Japan a few weeks later than Famitsu did.
I support both Nintendo and Sony. I have been a bit more vocal towards Sony lately because they are the ones struggling and I want to see them succeed.