1/2's or 1/4's are a individualized choice some prefer 1/2's and other prefer 1/4's.
Pluses for 1/2's; Consistent with the M14 NM sights. If you're a convert then it makes the transition easier. Not as many clicks to count to put your dope on the sight.
Pluses for 1/4's; If you're shooting tight, 1/4's allow you to dial into the center more precisely.
Personal experience;
I got my AR with 1/4 wind. While shooting at 600 yards I realized it took more time to make adjustments because I'd be thinking in terms of 1/2's and converting to 1/4's before putting it on. When the wind started switching, I'd click and shoot. When the wind died, I had no idea how many clicks of wind I had on because the numbers were so big (twice as much as 1/2) and I couldn't get back to my "no-wind" quick enough.
From the other side; (I switched to 1/2 wind after that first match)
I shot in a reduced match. I was consistently shooting tight 10's on the 600 reduced target at 9 o'clock. I put 1 click of right wind and found I had clicked through the x ring into the 10 at 3 o'clock. At that point I regretted swapping my 1/4's for 1/2's.
Good luck.