They allow you to print a fine but bold and permanent line.

2) the top line measures .030" or roughly 50% wider than the Sharpie Ultra Fines I used to carry that only mark on things they deem appropriate at times they are willing on days they feel like working

It doesn't roll off the table; it can make fine lines or broad lines; it's easy to hold.

like the bold line this marker produces.

but you can see that the Pro Chisel Tip has a finer line width than the Standard Chisel Tip