Well i usually use a 1/16 but -
You should have made the fractions into a common denominator so its easier to compare.
Making it 12/64 or 5/64 and the 5/65 is very close to 1/16 it is about 1.25/16 which makes no sence in math terms but lol its really close to 1/16.
SO go with 5/64 and if its not big enough you can drill over it with the 12/64 (or 3/16)
Jumbo