In my opinion, and its just my opinion I am no expert, the compact and the 4 inch are gonna be pretty much the same as far as accuracy, remember these guns are really designed for carry and defense. I don't think the are really target guns. and big bulls is right about the porting of the barrel. I have heard and also know alot of cops and homicide detectives that most shootings happen within 24 feet. Like Home invasions and robberies. Get what you really want, it is your money but if you can try to go to an indoor range that allows you to rent guns and try one out. I love mine but you might have diffrent wants and expectations.
P.S. I put a glock .357sig on hold and then shot one that night and HATED it. so I went back and got my money back!