Synetics :)(:

Which is wiser? a pen or pencil? A pen because when using that you shouldn't make mistakes.

Which is easier to forgive? a street or a sidewalk? A sidewalk, people are killed on streets.

Which is smarter? A clock or a calendar? A calendar because you can plan things ahead and not double-book yourself.

Which is more fearful? new or old? New because if you get a new shirt you don't want to get anything on it or damage it.

Which is more difficult? a dream or a nightmare? A dream because you have a hard time staying asleep as long as you want.

Which has more pride? an entrance or an exit? An exit because it takes a lot to walk out on an argument.

Which is like a legend? A mirror or glass? A mirror, it shows every imperfection on you.

Which is more useful? a friend or an enemy? An enemy, they challenge you more which can help you in your future. 

Which costs more? a home or a house? A home you have to invest more time in it.

Which is like a valentine? the truth or a lie? A lie, Valentines usually say I'll Love You Forever, is usually always a lie.