Why use the pen tool over the pencil line and paintbrush tool?

Why use the pen tool? A Rhetorical question could be used to answer this question, which is why not use the pen tool? I mean I am absolutely no pro at this but I have found the pen tool to be quite efficient when tracing or creating objects.. The pen tool envelops all characteristics of other the aforementioned tools making it the preferred choice when creating curved lines between two points. It brings back memories of csec geography using a string and pin/tape/glue to carefully plot a path or outline around a an border of a country as a means to ably measure the distance accurately. It is the best tool i have used thus far.