Hi,
I use 1/4 dot and I like it, I agrree with Dave for the reason for smaller dot, the "trend " I have seen is that older shooters go to bigger dots, I think it makes it easier to aim, dot size is your personal prefference so I would suggest that you try few sizes before you make your decision, and I do not mean 1 or 2 shots, shoot at least 40
hope you will find your match