Youth vs. Brains

From Gallup recently released this study which focused on the amount of youths migrating to different countries and comparing their numbers to the amount of educated persons also migrating. One of the studies looked at different percentages of developed regions whom are more likely to attract younger people than educated people. Australia overall have the highest potential net migration at 155%, with Youth having the highest percentage at 271% v. the 186% potential net brain gain index. Potential Net Migration Index created by Gallup is three indexes to gauge the likely changes to the population if people who say they would like to migrate permanently actually move where they want. Higher the score the larger potential for net population gain. But another interesting result showed that the US is more likely to attract the less educated with Canada ranking highest in both net brain potential and youth. What do you think? Would you rather have more brain or youths and is this important for countries to consider when thinking of tightening borders?