Should i upgrade to an Iphone 4 or 4s?

I have an iphone 3g and i hate it i can't download any apps with the low ios so i'm definitely upgrading to the iphone 4 but i just wanted to know if the iphone 4s is really that much better. They are the same size and the only real differences are the cameras and siri. And i have heard that siri often doesn't recognize your voice and i'm the type of person who's voice almost is never recognizes by apps so i was wondering if it is really worth the extra money

I had the iPhone 4 and upgraded to the 4s i Really love it so much! It just feels like it goes much faster i don't know why. Siri is very nice too ^.^. But the best feature is its camera i would get it if you like taking pics or videos and stuff like that. (vine, Instagram) If it were me i would definitely get the 4s because i love instagram and vine xD.

Get a samsung galaxy s 4

Get the 4S. It is faster, has a better camera, and will take longer to become obsolete.