I carry the department issued Remington 870 in my squad car but have to turn that in at the end of the shift.
I too use an 870 at work that I have to turn in at the end of shift.
With that said, I have more time on the 870, because of work and training than any other shotgun. Therefore I keep my HD Shotgun the same as my work shotgun.
During the middle of a high stress life or death encounter is not the time to try to remember the manuel of arms for any weapon. It needs to become instinctive. Thus the 870 should be, IMHO, your choice since that choice is already made for you at work.
My rifle is the same as what is issued at work as well. It makes things simple. The only difference between my work and home shotgun is that my home shotgun has a pistol grip with a buttstock. This tells me that my safety is located on the left side of the gun, given that I'm a lefty. The other shotties, that don't have the pistol grip, have the safety on the original side and that tells me that I have to bring my gunhand up under the trigger guard to release the safety.
Biker