I have both 500 and 870, the 870 is tactical model w/ghost sights, nice. The 500 is the plastic stock set w/pistol grip, matte finish. I added houge pistol grip set, very nice shooting with the pistol grip even one handed. I recommend both guns, mine both of 300+ 12g rounds down the tube.
The 870 is a beast with the steel receiver. The 500 is lighter, and has double extractors. The bonus with the 870 is a loader gate ramp, to keep shells from falling out of the bottom which I had once or twice in my 500.
You can't go wrong with either, they been making guns for years. I would just flip a coin if I had to do it again. Really enjoy both of mine.
Has Taurus really spent more on shipping customers their firearms back to them than actual sales?