I don't think I can answer what is better for you in "gauge". As some have said you need to weigh alot of options here. What you "need" is one you feel comfortable with, and one you will feel comfortable defending your life with.
I do agree with the semi-auto folks. I have heard TONS of times (and even stated here) that the cha-chink sound of a slide is a deterant. I hate that....we're not talking about defending my liquer store, or my impound lot or someother place of bussiness. This is my home. The only thing I want the BG to here from me is the blast that takes his life! Now some folks may say thats wrong but I'm not out walking the street. In that senerio with my CCW, yes, my mission is to get out of the situation unharmed and it "may" come to me shooting to do that, but only if I have to. In my home...whole different story. Keep in mind to check your local laws, but here in Ga. someone illigaly in my home is someone getting shot.
Let's use the "pump slide scares bad guy" scenerio: Your laying in bed and BG has already crept silently to the end of the hall at your bedroom door and is opening the door. You have awakened with him 3/4 down the hall and are alert and have shotgun in hand by the time he puts his hand on the knob.
Thats the scenerio for arguments sake...here's how things could go ugly with a pump.
#1. The BG is opening the door and you rack the slide...the BG turns to run but desoriented runs into another loved ones room...uh-oh hostage situation!
#2 The BG is opening the door and you rack the slide...The BG is turning to run and sees someone at the other end of the hall (aparently daddy and mommy aren't the only one that heard a disturbance) BG has no time to think only reacts to the shadow *BLAM* dead kid BG runs on away...
#3 You let the BG open the door and then rack the slide...BG already has weapon in hand and fires in the general direction of the noise...does he hit you??? Did he hit your wife laying next to you??? Do you realy wanna take that chance???
Here's the scenerio in the Brady household (yes I share the same last name as that psycho, but thank the good Lord totaly different views)
BG has his hand on the knob, I have the shotgun pointed at "roughly" center of mass for the average man toward the door with safty off, as the door is opened, I'll be able to tell the size the person entering and the shotgun is adjusted accordingly in a split second meanwhile I am concentrating on my eyes adjusting to whether I know this person. As soon as I have a confirmed I lower the weapon or pull the trigger according to wich accesment was made.
Now like I said, I am fortunate enough to live in a state I can do this and I also have no little prying fingers...so my shotgun is loaded and leaned in the corner of the rooom only two feet from my pillow. Others may not have that option and I am by no means telling anyone they should use my method. I just hate hearing people say "racking a pump, will scare the bad guy away" or "everyone knows what a shotgun slide sounds like" because yea! Everyone knows what it sounds like...and it will scare them...away??? thats yet to be seen, but a scared animal is a dangerous one, and in a home invasion they are in unfamiler territory, so now you have a scared, and (feeling) trapped animal...Not good!
Before you ask, yes that very scenerio has happened to me. Turned out to be a buddy trying to wake me without waking the rest of the house (very caviler of him..
I bet next time he wakes the whole neighberhood pounding on my door before he walks on in!
) I was able to descern friend from foe before a life taking mistake was made and lowered the firearm. I also found out that it took him just as long to register I had a gun as it did for me to register who he was, so had it been the BG I had him dead to rights...
Didn't mean to rant (and in all actuality wasn't just giving you food for thought) I wanna make sure you get the right home defense weapon for YOU. Not me, or the guy that lives next door or anybody else...YOU!
Hope I've been a help. I also hope I stimulated some thought on this "I just racked a shotgun so fear me you piece of garbage" mentality when it comes to someone in your home...