I have a 50" Panasonic Plasma in the living room and love it. However, when it came time to put something smaller in the bedroom I decided to go with LCD. After researching, reading reviews, and visiting multiple stores I actually ended up with a 42" Vizio. It's been great. So, I guess my advice is like some others have said before, maybe broaden your pool from just these two televisions.
That being said, if you have already done all of your research and these are your two final choices, then I would go with the Panasonic. LG is a good brand, but I've known people who have had problems and my experience with Panasonic has been great.