Hippie44 -
Big Bore's advice sounds good. I have never seen the Millet sight, but I can testify about the Bowen sight.
I have always bought excellent binoculars and rifle scopes, but never gave much thought to handgun sights. The ๑ Bowen sight I bought for my SBH was AMAZINGLY better than the standard Ruger sights. And only a fraction of the price of a good rifle scope! What a deal! Not only is the sight picture much sharper, when I installed them I then realized how much reflective glare I was getting off the rounded mounting surface that holds the sight blade on the standard Ruger sights. I get on target much faster with these sights.
NOTE: the installation instructions that come with the Bowen sight are good, but they suggest having a gunsmith to install them. I am no gunsmith, but not having a gunsmith nearby I did it myself, took my time, did not use the 'big hammer' approach, and they fit just fine. Mine fit very snug. I think I had to do the tiniest touch of filing with a new fine file in the milled slot for the sights to drop in, and I needed to buy a very small punch tool (like 1/16") to drive out the pin that holds the sight in place.