Samsung Galaxy Note or iPhone 4S?

[Lucy]

I was an iPhone 4 user, but it unfortunately got snatched from me.

I'm going to buy a new phone and I can't decide between Samsung Galaxy Note and iPhone 4S.

I know a lot of things about iOS already and I've grown to be comfortable with it, and I would love to get an iPhone 4S, but I'm just a college student and I'm on a budget (I don't want to ask money from my folks). So, I'm wondering if it's worth ditching iphone for a galaxy note, or should I just stick with the iphone?

here are my needs:
internet anytime anywhere (much like iphone's cellular data)
a good camera (sometimes this is what I use for notes.)
school-related apps like dictionary, converter, encyclopedia, etc (this is what made me love iphone)
..basically that's it.

I would also like to know if Samsung Galaxy has these apps:
Instagram
Foursquare
Viber

thank you!
please choose just between the two thanks!