GR, I'm retired from the Md Dept of Public Safety. For ten years or so I taught hundreds of Correctional Officers to shoot.
We used and use Remington 870s. Tower weapons take an incredible amount of abuse with little/no regular maintainance. Like the old and venerated Winchester 12s and 97s, the 870s just keep on working and working. Training weapons fire thousands of rounds per year, one there had been on the firing line from 1981 to 1998 AND may still be in service.
FYI, there's 4 870s here at Casa McC, including Daughter's 20 ga. One my father bought used around 1956, it must be one of the first off the assembly line. After at least 3000 rounds through it, it's tight and working fine. Zero repairs.
Get what you want, but if you do not consider the 870, you're doing several generations of your descendants and yourself a disservice....