Thoughts on Stoeger?

I'm looking at a few different shotguns to get for my first; two of them are Stoeger's. The first is a P3000 12 gauge with a 3" chamber and a 24" barrel. The other is a P3500 12 guage with a 3.5" chamber and 26" barrel. Which of these would be better in your opinion?

Also I know that this is a stupid question (i'm new to gun ownership and shotguns in general) but would 2.75" shells be able to be firied out of a larger chamber like a 3" or 3.5"? thanks.