For me, it varies on the cigar size and strength. . . who said that? 
However, the Punch seems to be the most popular for me. 
While I (personally) don't care for a V cut, XiKar has a great tool and Colibri also came out with a good one.  
FWIW:
I designed a 4-blade Punch Cutter. Looking for a manufacturer now. It's really tiny!  Like the size of a AA battery with a twisty cap thing.  Probably need to find a watch maker to build the prototype.  But, if it works, it will be the best punch cutter yet.  Sizes?  Ok: 6-mm, 8-mm, 10-mm and 12-mm diameter holes.  What's your hole size?