Nope, it's all about the pure APR. You can ignore the X, that's just one factor that affects the APR for each den or pod. But the APR is the only thing you need to look at. Whatever has the highest APR is where you get the most gains. But farms have risk in having either pair of your tokens sold if that token goes up in order to buy the other token pair to match in the equal USD value of the LP token.