The reason why we chose Regza again (same as the one we've had) is mainly because of the price - no other manufacturer offers 42 Inches at 70000 yen.
The Regza also looks better than the other designs. I did want to get a Samsung but they dont sell them in Japan for some reason.
Another reason is for its game functionality too which I'll talk about more later in this post.
The first run experience on the XBOX is terrible - you have to jump through hoops to signup on the Japanese version. At one point it asked me to go and signup on a PC! As a result, I've not set it up to enable me to download paid stuff as its so bothersome ><
The Play Station Network has been the best user experience so far.
Usually, when you attach a retro game machine to a HD TV these days, the graphics look completely crap - thankfully, the Regza TV comes with a retro game feature with an algorithm which makes the graphics look decent on a big screen.