Generally 1/2" shanks are stronger than 1/4" shanks due to the extra thickness. They also tend to vibrate less due to the extra mass. I usually try to buy the 1/2" shanks if given a choice, but each size shank has it's place. After awhile you will end up with a mixture of 1/4" & 1/2" sized bits in your collection. If it's something like a 1/8" round over I will use a 1/4" shank bit & use it in my laminate trimmer.
Have a nice & safe day!
Last edited by jlord; 08-03-2010 at 06:45 AM.