Over the past year, three Foolish analysts -- Travis Hoium, Alex Planes, and Sean Williams -- have come together to decide whether certain stocks were worth your money or if you were better off staying away. We've been debating the merits of individual stocks all year, and after 21 up-or-down picks, we're beating the S&P 500 by nearly 200 points. However, not all of these selections have gone our way. Sometimes we make choices that later come back to haunt us, and at times we make choices that our two fellow Fools disagree with but that turn out to be right in the end.

With that in mind, we'd like to take a look back at both our biggest regrets of all our selections this year and the one debate that we point to when it's time to say, "I told you so!" Read on, and you just might avoid making the same mistakes.

(GMCR.DL)

(GRPN -0.61%)

Sean: So far, that'd have to be green-thumbing Chesapeake Energy (CHKA.Q) in spite of the fact that I think the assets are grossly undervalued. One of my prime rules for stock picking is to buy into companies where I believe in the management team. Chesapeake CEO Aubrey McClendon is a lifetime offender when it comes to corporate governance, which earned him second place in this year's "Worst CEO of the Year" voting. That should have automatically thrown up my suspicions about Chesapeake and kept me on the sideline.

I told you so!
Alex: Guys! Why did you think Chesapeake Energy was going to be a big winner in August? Both of you distrust its CEO (to say nothing of his turnaround vision), but you still saw better days ahead for a company reliant on a fuel source that's barely profitable at scale. Large energy companies can be cyclical, and I don't think the cycle has turned yet to favor natural gas producers. We've been waiting for a nat-gas rebound for years, and I think waiting longer, if not going the other way, would have helped our score.

(BP -1.17%)

Sean: I told you guys that ATP Oil & Gas was on its death march and both of you decided that it'd be better to wait on the sidelines. Instead, we missed out on a 100% gainer because ATP declared bankruptcy just three months after our debate. The company, which had made significant oil finds off of Israel and operator deepwater wells in the Gulf of Mexico, had $1.5 billion in debt due in 2015 and couldn't find a way to make a dent into or restructure its debt. This seemed like an obvious down-thumb, but that's the way the cookie crumbles sometimes.