You need to see some samples so /you/ can make that decision. As
usual, these choices involve trade-offs that only you can make. I'll
let you look at similar parts cut with 1/8", 1/4", and 1/2" bits (most
of the difference in smoothness results from flexing of the bit.)

Can you tell me how many hexes would be produced with the 1/8 or the
1/4 or the 1/2 bits? I am guessing that there is not a tremendous
difference in number?