Neo, the 4 lb trigger is quite controllable.
Im sure it is...for a shotgun. However, a weapon being "controllable" is not always enough. For a handgun (for HD use anyway), I remain dubious as "light" triggers are, IMHO, more prone to unintentional fire...hence, possibly leading to disastrous legal consequences when it comes to HD or the like. Either way, I "catch your drift." However, Ive never felt the need for a 4 lb trigger (SG or pistol) in order to effectively defend my home or myself, family, etc. Sure, it may "feel" more sexy, but its not necessary when the weapon is controllable, accurate and reliable as is. Essentially, heavy triggers dont bother me much; its the sloppy triggers that I tend to have an issue with. None of my weapons seem to have this issue (Mossberg, Benelli, Sig, Springfield Armory, etc)...as far as I can tell anyway.
Of the bunch, I like 870s best, because I have more trigger time and training with them.
This says alot...whether an 870, a 500/590, Browning, Benelli, whatever, it seems that "trigger time" leads to familiarity, which leads to comfortability/confidence, which leads to...you get the idea.
Whether slick triggers are your thing or custom finishes or various features and whatnot, pump shotguns are reliable, useful and fun. Basically, it all comes down to personal taste.
My personal tastes revolve around accessibility/functionality (reliability goes without saying). This is what sets the Mossberg apart from the 870, IMHO. Now, whether the parts will last as long, I dont know. But, thats what replacement parts are for...so Im not concerned.
The 870 may be slick, but the Mossberg (in my case, the 590A1) is just as reliable (once that pesky mag tube spring issue has been dealt with), smooth and well built as any 870 Ive ever handled/shot. Even if it were not, its what Im familiar with, its what I shoot all of the time and its what I trust. But, then again, Im speaking strictly from an HD use perspective...not that of a hunter, sportsman or whatever. In terms of that other stuff, I cant say.
Hence, my "focus" and needs are somewhat limited, but its this "limit" that Im concerned with exclusively. All else is just icing to me.
Regardless, Im of the opinion that this thread should be titled "Best pump shotgun for YOU." This is more appropriate.