In sports betting, it is not bad to bet on strong teams rather than betting on emotions. Because strong teams do better in the long run. We often see in league tournaments where good teams are at the top. However, there is also uncertainty because sometimes those big teams lose matches against much weaker teams. It is not known which match they will lose and which one they will win, because of which there is uncertainty in every match. In the case of betting, the gambler must make proper analysis and place bets. In order to get good results, experience is also needed along with skill. Those who place bets based on skill and proper analysis will get comparatively better results than others even if they lose.
You said all, betting on strong teams with emotions involved might turn around to be against your favours because they can turn to be the losing one and then you will get disappointed. So, big teams don't give one the reasons that everything will be as you planned and before you know it everything got scatter. Always have a backup plan, as emotions can trap someone into making choices that turn into frustration and pains, as there will be no better result in it.