Tobacco will actually act as its own filter thus a longer cigar will taste cleaner than a short one. The size of a cigar is all centered around the ring gauge or the diameter of the cigar. A ring gauge is one of the few recognized industry standards that can help you find the size of which you are most comfortable. The length of the cigar is described in either inches or centimeters depending on which side of the Atlantic you reside. No industry standards exist as to universal definitions of shapes such as robusto or churchill .
Standards are regular variations of shapes that are straight and symmetrical.
Figurados are shaped, meaning some form of tapering or unusual form such as a celubra, torpedo, or perfecto. For more information on shapes visit The Cigar Glossary link box area. Most importantly you should select a size and shape with which you feel comfortable. Try different shapes and sizes and find what you enjoy the most. Chances are that any brand will have a shape you enjoy.