I may get in trouble for saying this, but all the Raleigh's I've test ridden, or worked on, are HEAVY! I think on their entry-level frames are built with some thick aluminum tubes.
Other than that, they're both good bikes. Raleigh is one of the oldest, if not the oldest manufactuer of bikes in the USA. Trek is currently the biggest. You do not get either of these accomplishments making an inferior product.
L8R
__________________
"Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming, "WOW, What a Ride!" - unknown
"Your Bike Sucks" - Sky Yaeger