Is there a significant difference between seagull guitars and fender guitars ?

I'm 13 years old and taught myself how to play guitar.. it's been about 6 months since I started playing.. I guess I'm pretty good for a "beginner". I got an acoustic Fender about 4 months ago, and it's okay. Its sound isn't as full as it used to be. Anyway, I was looking in getting another guitar, preferably in the $600 - $700 range, or cheaper, but I want some quality. I was thinking of getting a Seagull; is it worth the money ? Is there a significant difference between a Fender and a Seagull, sound wise ? thanks