Perfection vs. Non-Perfection

My senior year of High School we started our first soccer team. That was the '98-'99 season. WOW what a long time ago.... Our record that first year was 0-6-1. That's correct, 0 wins. We had a few close games, but the best we were able to do was one tie.
When my brother Bob was a senior in high school, they had a fairly decent team. The leading scorer had 25 goals for the season, which is definitely a good mark. I believe they may have lost in regionals/sectionals against jacksonville or quincy notre dame, or somebody that had a pretty good team that year. His team had some talent, and while I am not for sure on the final record, I know they won more games than they lost.
Fast forward a few more years to the '07-'08 Teutopolis High School soccer team and my baby brother Michael is a sophomore. As a sophomore he was looked at to be one of the major scorers for the team. Game one he gets tackled and falls on his wrist/hand and breaks it. He is now out for the majority of the season. He made it back in time for the postseason and the final push which carried the team to the State Tournament in Chicago for the first time ever. At state they were slayed by Rochester who just had way more talent and skills and knowledge of how to play the game. Still a great result for Teutopolis High School.
What do you know, but the 2008-09 team starts out 10-0. A perfect record with a lot of excitement and optimism for the season. Michael (now a junior) being healthy leads the team with a School record of 26 goals with several games left in the season. On Tuesday night the team played Charleston High School always a perennial powerhouse in soccer plus they are a bigger school to a 1-0 loss off of a free kick by a club soccer teammate of Michaels. A stellar game it sounded like from what I read in the papers. A defensive struggle with TTown only able to get one shot on goal. But a loss is a loss....
Which brings me to my current question:
Is it better to have an undefeated season or to have a loss or a few losses? I'm sure there are many different opinions on this, but here is my view:
Perfection is a very hard thing to do in sports and carries with it a lot of pressure. Where a team gets in trouble is when they start playing not to lose (conservative), because they are afraid of not winning. (If that makes any sense) I think a loss or two can be a good thing because it can be motivating, and can help a team continue to play aggressive to win, and not be so conservative which is how a team plays when they are so afraid of losing.

What do you think? Perfection or a loss or two?