People assume Sasuke was stronger in part 1 because Naruto lost the fight but in reality Naruto not holding back would beat Sasuke every time. Let me explain
#1 Sasuke got lucky Naruto didn’t summon gamabunta. Let’s be honest Gamabunta was strong enough to fight a tailed beast. What would Sasuke have done?
#2 Sasuke got lucky Naruto scratched his headband instead of delivering the final hit. Naruto made Sasuke a bet. Naruto could’ve attacked anywhere on Sasuke’s body and won the fight