Wow...your somewhere between eps 10 - 19. TV Tokyo in Japan has released 155 episodes so far, with 156 coming out this week (my thoughts later).
Naruto and Sasuke, to answer your question without ruining anything, they are very competitive. Sasuke has way more potential because he's a genius, and Narutos only now finding out his potential. Hard to say who's better...the're both growing in skill...
well actually sduring their last fight Naruto wasnt stronger than Sasuke. They are about equal judging from the last fight. Sasuke was messing around with him and making fun of him and stuff till the Kyuubi came out. Naruto started kicking Sasuke's butt till Sasuke activated the demon seal and became equal or a little stronger than Naruto