Build quality reliability and mobile carries sales peoples views are all very subjective.
My nephew has had no less than 10 I phones. Broken all of them, is this quality issues no - He takes them onto the work site and brakes them his fault.
His work friend has had around 5 Galaxy's and did the same and again its his fault.
My niece, iphone5 signal issues volume issues battery issues (she claims its viber) volume buttons upside down YES upside down check yours. That's quality and build issues.
My friend bought her first Galaxy s3. 4 months, restarts when camera is used on od occasions crashes when some apps are opened. Spent half the time in the shop. Quality and build issues admitted by Samsung who replaced her phone free of charge as they should.
In the end get what ever you want, because so many parts are built by others this reliability buikd quality line is so subjective with phones. The only real difference id the operating systems because parts are do broadly shared.