Anyway, under is not always the correct answer as it really depends on the match, the teams, the gameplay and many other factors but most beginners end up getting too excited and betting mostly on over without proper analysation.
I will say this on this regard, play a bet with your best of abilities because there lies the opportunity of wining or losing, also, you need to know that there is more of having taking risk in playing bet with the option of under or over, if we truly understand why and how we could safely choose any of them and be free of being disappointed at the end, some of us may just needed to know the best of the gambling skills to be able to know which option to take and always stand out in playing out bets.