I just picked-up my Trek 520 this weekend--so I'm partial to the Trek. I had an early 80s Motobecane Tourer for 15 years, and the Trek felt much more solid comparing the two. It rides like a Cadillac on cruise. I haven't taken it on a long tour yet, so I can only comment on the commuting experience now. I'm perfectly pleased.
Cheers,
Urbanmonk