both my girlfriend and i have galaxy s4 and honestly the otterbox is NOT that big i always leave the clip/front protector off and it makes fitting in my pocket easier. My girlfriend has bodyglove from walmart only costed 20 bucks and it protected hers from many of falls so its really your preference
I picked otterbox because of a few reasons:
it has many layers of protection:
1:the plastic sturdy stapon casing that looks ugly
2:the rubber and solid part that goes around it (which is really nice in hand them other cases are just as slick as the phone itself the phone never slips out of my hand now)
3:the screen protector
4:the extra protection of the clip/face cover that back also be used backwards so the screen is facing out...ALSO the clip can be pulled out to serve as a phonestand!