A pump gun may have slightly fewer breakdowns than autos in or out of the field but as with most things this depends 100% EVERY TIME on the maintenance of the gun and the quality of firearm that it is to begin with. It is hard to find a better pump than a field grade 870.
But,
A good auto depends on the same things but is even more dependent on proper maintenance. You must know what you want to do with an auto to make it perform properly.
Autos, especially older guns, have either certain mechanical things that must be done to them to fire heavier or lighter loads. You may just have to look in the owners manual and follow its instructions on care and suggested ammunition.
From my experience, and my opinion only, A good auto is the only way to go. They are generally lighter, better quality and better shooters than pumps. If you want a bullet proof shotgun the closest you can get is either a Bennelli. a Berreta, a Remington or any other major manufacturer.
But be forwarned! A Good quality auto is much higher than a good quality pump. My Benelli Super 90 is about as bullet proof as you can get but it is was twice as much as my favorite Rem 870 Wingmaster.
Oh, by the way, you will hear that autos don't kick as much as a pump. HAHHAAHHAHAHHH!!!
Don't belkieve that one!
I have a Franchi AL-48 20 gauge that weighs in at 5.4 pounds. and it kicks like an army pack mule! The light weight is what does it. The lighter they are, the harder they Kick!
Best thing to do is go buy you a benelli, a berreta and a new benelli pump and remington wingmaster and test them out! (I am sure the misses won't mind, but, you might not want to tell her about them until you get them home!)