Remington 870
Mossberg 500. The quality of the Remington 870 express has declined in the last few years.
No problems with my 870. I'd like to see your stats on failure rate of the 870 vs the mossberg instead of just hear say. It's Chevy vs Ford. They both have their positives and they both have their negatives. You do your research, and decide which design you prefer..
Mossberg 500 or Remington 870 are probably popular and you can't really go wrong with either. After market add on's are available for both and they both have MANY options for you to choose from. Both are very versatile. Good luck whatever direction you end up going.
Anyone who doubts the QC issue with Freedom Arms products, take a 870 Express from 10 years ago and compare it to a new 870 Express side by side.