I have to say I'm a bit biased towards the Remington 870. Of course, that might have to do with the fact that I own one!
Seriously though, they're both respectable models.
“Firearms are second only to the Constitution in importance; they are the peoples’ liberty’s teeth.” – George Washington
If you are not free to choose wrongly and irresponsibly, you are not free at all. – Jacob Hornberger (1995)
“Among the many misdeeds of British rule in India, history will look upon the act depriving a whole nation of arms as the blackest.” – Mahatma Mohandas K. Gandhi