I have an 11-87 with a 26" barrel that I use (when I can) to go bird hunting and what not. It has never failed me and functions flawlessly with the lightest of bird loads or the heaviest of buckshot loads. Sure, it might not have the rate of fire that a Saiga can sustain, but the reliability is without question - I'll take reliability and ease of Remmy mods/parts/repair any day over a rate of fire in such a weapon. While I didn't even know they made a "tactical" variant of the 11-87 until this thread, I can't see Remington changing the action any. Were I to pick a semi-auto shotgun for "tactical"/home-defense, I wouldn't think twice about picking an 11-87 over a Saiga. I'd pick the Saiga for a fun gun, but that's about it.
/my .02
edit: I see you already have an 11-87, so this may be a worthless post. So be it.